CBSE Questions for Class 12 Medical Physics Ray Optics And Optical Instruments Quiz 2 - MCQExams.com

A long-sighted eye can see:
  • near objects clearly
  • far-off objects clearly
  • both near and far-off objects clearly
  • none of these
A prism is a piece of transparent material having _____ triangular and _____ rectangular surfaces.
  • three, two
  • two, three
  • three, three
  • two, two
The pupil of the eye changes its size to adjust for
  • objects at different distances
  • different amount of light
  • objects of different sizes
  • different colours
How should people wearing spectacles work with a microscope?
  • They should keep on wearing their spectacles
  • They should never use the microscope
  • They should take off their spectacles
  • They may either put on their spectacles or they may take off their spectacles
Identify the part "D" from the shown figure of human eye : 
283830_7d0f1374d37643dfadc5ac999da1c2cc.png
  • Retina
  • Cornea
  • Pupil
  • Iris
The relation among $$u$$, $$v$$ and $$f$$ for a mirror is:
  • $$f=\dfrac{uv }{u + v}$$
  • $$v = \dfrac{fu}{u + f}$$
  • $$u=\dfrac{ fv}{f + v}$$
  • all of these
One cannot see through fog because .......... .
  • Fog absorbs light
  • Refractive index of fog is unity
  • Light suffers total internal reflection at the droplets in fog
  • Light is scattered by the droplets in fog
Identify the part "C" from the shown figure of human eye :
283831_f9fe7f6ddbb642b3b3fcaf5b9d4936b5.png
  • Retina
  • Cornea
  • Pupil
  • Iris
In optical instruments, the lenses are used to form images by :
  • reflection
  • refraction
  • dispersion
  • scattering
The 'pupil' in human eye can be dilated by:
  • retina
  • choroid
  • optic nerve
  • iris
The phenomenon of light bending due to change of medium is called:
  • Reflection
  • Refraction
  • Dispersion
  • Total internal reflection
In dim light:
  • rods are sensitive but cones are not
  • cones are sensitive but rods are not
  • both rods and cones are sensitive
  • neither rods nor cones are sensitive
Which of the following is correct about astronomical telescope?
  • It consists of two diverging lenses
  • Its objective is a concave lens
  • Its eyepiece is a convex lens with greater focal length than the objective
  • The final image in this telescope is inverted
The magnifying power of a simple microscope can be increased if we use an eyepiece of
  • Higher focal length
  • Smaller focal length
  • Higher diameter
  • Smaller diameter
The cells in the retina that are able to distinguish between different colours are :
  • Rod shaped
  • Cone-shaped
  • Cuboid shaped
  • Long and flat
Assertion: A concave mirror and convex lens both have the same focal length in air. When they are submerged in water, they will have same focal length.
Reason: The refractive index of water is smaller than the refractive index of air.
  • Both assertion and reason are true but the reason is the correct explanation of assertion.
  • Both assertion and reason are true but the reason is not the correct explanation of assertion
  • Assertion is true but reason is false
  • Both the assertion and reason are false
  • Reason is true but assertion is false
Aqueous humour is a _________ and  vitreous humour is a _________.
  • Transparent jelly, viscousfluid
  • Transparent jelly, watery fluid
  • Viscous fluid, viscous fluid
  • Viscous fluid, transparent jelly
Shape of eye ball is:
  • Flat
  • Spherical
  • Oval
  • Fish shaped
When a wave travels from one medium to another, the quantity which will not change is its
  • Amplitude
  • Velocity
  • Frequency
  • Intensity
Transparent front part of eye is:
  • pupil
  • cornea
  • iris
  • retina
The screen behind the eye lens is called :
  • Iris
  • Ciliary muscle
  • Retina
  • Pupil
When you enter a dim lighted room from sunlight at noon time. What is the change in size of pupil?
  • In the sunlight pupil contracts and after entering a dim lighted room the size of pupil increases.
  • In dim light size of pupil decreases and in sunlight the pupil size increases
  • Both  A and B can  occur.It depends on the size of eye
  • No change in size of pupil
Function of optic nerve in human eye:
  • Image is modified by the optic nerves
  • Electric signals are generated on the retina are carried by the optic nerve to the brain
  • Image brightness is reduced by the optic nerve
  • All the above
The image which can be obtained on a screen is called
  • a virtual image
  • a real image
  • either a real or a virtual image
  • neither a real nor a virtual image
The image which can not be taken on the screen is called
  • a real image
  • a virtual image
  • either a real or a virtual image
  • neither a real nor a virtual image
When the reflecting or refracting rays do not actually intersect but appear to intersect when produced backwards, 
  • a real image is formed
  • a virtual image is formed
  • either a real or a virtual image is formed
  • neither a real nor a virtual image is formed
The image formed behind a mirror and a virtual image
  • are of same nature
  • are of different nature
  • are of same nature only in space
  • are of different nature only in space
Whenever light travels from denser medium to a rarer medium:
  • it bends away from the normal
  • it bends towards the normal
  • it passes undeviated
  • it always reflects back
A virtual image is
  • always erect
  • either erect or inverted
  • always inverted
  • neither erect nor inverted
A real image is formed by
  • actual intersection of the refracting or reflecting rays
  • imaginary intersection of the refracting or reflecting rays produced backwards
  • either actual or imaginary intersection of the reflecting or refracting rays
  • neither actual nor imaginary intersection of the reflecting or refracting rays
Telescopic aids are used:
  • to view planets and other astronomical activities
  • to view chalkboards and class demonstrations
  • for performing computational tasks
  • helps visuaaly challenged people in reading and writing
A manufacturer uses a concave lens instead of a convex lens in a magnifying glass by mistake. What will be the effect on the working of the lens?
  • Images will be blurred.
  • Images will be clearer.
  • Images will be diminished.
  • Images will be further magnified.
___________ is an optical instrument which forms the image of a very far off object nearer to the eye so that the object is seen distinct and bigger.
  • Telescope
  • Simple microscope
  • Magnifying glass
  • Periscope
The eye-piece lens of a telescope forms a
  • virtual, erect and enlarged image
  • virtual, inverted and enlarged image
  • real, inverted and diminished image
  • virtual, erect and diminished image
The magnified image from a simple microscope, by nature, is
  • real and inverted
  • virtual and inverted
  • real and erect
  • virtual and erect
A terrestrial telescope is used to view the details of the distant objects on the earth.
  • True
  • False
Figure shows ray diagram of a
455049_135709c4609f446bb76de5dd18ea8213.png
  • Simple microscope
  • Compound microscope
  • Binoculars
  • Telescope
Which of the following is true for a telescope?
  • Final image is real and inverted.
  • It increases the size of the object.
  • It increases the angle subtended by image at the eye of the observer.
  • Smaller telescopes are more powerful
The objective lens of a telescope forms
  • real, inverted and highly diminished image
  • real, erect and highly diminished image
  • virtual, erect and magnified image
  • virtual, erect and highly diminished image
A telescope uses
  • 1 convex lens and 1 concave lens
  • 2 convex lens
  • 2 concave lens
  • 2 convex mirrors
Comparing real and virtual images, we may say that
  • Real images can not be obtained on a screen and virtual images can be
  • Virtual images can not be obtained on a screen and real images can be
  • Both real and virtual images can be obtained on a screen
  • Neither real nor virtual images can be obtained on a screen
Figure shows the ray diagram of a 
454682_9076dd06243f43a58aedfb8c19be0488.png
  • Simple microscope
  • Compound microscope
  • Simple Telescope
  • Compound Telescope
Virtual Image is always erect. Is statement True or False?
  • True
  • False
What is the formula for spherical mirrors for object distance p and image distance q ?
  • $$\dfrac{1}{p}+q=\dfrac{1}{f}$$
  • $$\dfrac{1}{p}+\dfrac{1}{q}=\dfrac{1}{f}$$
  • $$\dfrac{1}{p}+\dfrac{1}{q}=f$$
  • $$p+\dfrac{1}{q}=\dfrac{1}{f}$$
A glass prism has how many rectangular surfaces?
  • $$3$$
  • $$4$$
  • $$2$$
  • $$1$$
When is the real image formed?
  • when the rays of light after reflection or refraction actually go away from some point
  • when the rays of light after reflection or refraction actually meet at some point
  • when the sun rays after reflection or refraction actually meet at some point
  • when the rays of light after deflection actually meet at some point
Real Image is always erect. 
Is the above statement True or False?
  • True
  • False
What is a virtual image?
  • The image that cannot be caught on a screen
  • The image that can be caught on a screen
  • The image that cannot be converged on a screen
  • None
Why is it advised to used telescope at night?
  • During day, sun rays are very strong and it is not possible to see distant objects.
  • Night sky is clearer than day sky.
  • Both A and B
  • Neither A nor B
The change in focal length of an eye lens is caused by the action of
  • pupil
  • retina
  • ciliary muscles
  • iris
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