a) A simple microscope.

b) A compound microscope.

c) An astronomical telescope.

The lens placed towards the object in an optical instrument is called _______.

The equation of mirror formula is ___

In minimum deviation position of prism, the angle of incidence is equal to angle of ____________.

a) Write the type of radiation that 'Chandra' picks up to study the universe.

b) What are the advantages of setting up a telescope outside the earth's atmosphere?

[Given the critical angle of the glass used for the prism and the lens is $$42 ^{\circ}$$.]

The first telescope was designed by ________.

Name of an optical instrument which is used to see erect image of distant object is _______.

a) The focal length of the eyepiece of a compound microscope is larger.

b) A telescope of a binocular has two total internal reflecting prisms.

i. Plane mirror.

ii. Convex mirror.

iii. Concave mirror.

iv. Plane or convex mirror.

ii. Convex mirror.

iii. Concave mirror.

iv. Plane or convex mirror.

In a telescope the focal length of eye lens is greater than objective lens.

State whether the following statement is True or False.

Telescopes are used to obtain an .................. image of a ........... object.

Draw a concept map using the following terms.

(lens, real image, virtual image, optical instrument, camera, microscope, telescope)(i) Labelled Ray diagram.

(ii) Derivation of formula for magnifying power, when final image is formed at the least distance of distinct vision.

(i) Labelled ray diagram.

(ii) Derivation of formula for magnifying power, when final image is formed at the least distance of distinct vision.

When refraction occurs of a convex spherical refracting surface and the ray travels from rearer to denser medium

(i) a medium of refractive index $$1.6$$

(ii) a medium of refractive index $$1.33$$

Will it behave as a converging or a diverging lens in the two cases?

How will it focal length change in the two cases?

(a) optical center

(b) first focus

(c) Second focus

(d) center of curvature of the first surface.

Astronauts on the moon can not hear each other directly

If the angle of incidence at AB for which the ray strikes the diagonal face at the critical angle is X in degrees. Find X?

Match the paths in List I with conditions of refractive indices in List II and select the correct answer using the codes given below the lists

Draw a ray diagram for refraction at a spherical separating two media. For refraction at a spherical surface, derive the relation $$\cfrac { { n }_{ 2 } }{ v } -\cfrac { { n }_{ 1 } }{ u } =\cfrac { { n }_{ 2 }-{ n }_{ 1 } }{ R } $$ in object distance $$(u)$$, image distance $$(v)$$, refractive index of media $$({ n }_{ 1 },{ n }_{ 2 })$$ and radius of curvature $$(R)$$.

(a) Ray diagram for the formation of image;

(b) Expression for magnifying power when the final image is formed:

(i) At the least distance of distinct vision;

(ii) At infinity.

$$\dfrac { \mu }{ v } -\dfrac { 1 }{ u } =\dfrac { \mu -1 }{ R } $$

for refraction of light at spherical surface.

(b) Obtain the mirror formula and write the expression for the linear magnification.

(c) Explain two advantages of a reflecting telescope over a refracting telescope.

(a)Calculate the wave length $$\lambda_{0}$$ for which rays incident at any angle on the interface pass through without bending a the interface.

(b)For light of wave length $$\lambda_{0}$$ for which rays incident on the face $$A\ C$$ such that the deviated produced by the combination of the prism is minimum.

(a)Where should a pin be placed on the axis such that its image is formed at the same place.

(b)If the concave part is filled with water of refractive index $$4/3$$, find the distance through which the pin should be moved so that the image of the pin again coincided with the pin?

(b) Write serial number of the observation which is not correct. On what basis have you arrived at this conclusion?

(c) Select an appropriate scale and draw a ray diagram for the observation at S.No.Also the approximate value of magnification.

monochromatic rays of light are incident normally on the face AB of an

isosceles right-angled prism ABC. The refractive indices of the glass prism for

the two rays $$'1'$$ and $$'2'$$ are respectively $$1.35$$ and $$1.45$$. Trace the path of

these rays after entering through the prism.

Find the angular dispersion produced by the combination

stick figure O (the object) stands on the common central axis of

three thin, symmetric lenses, which are mounted in the boxed

regions. Lens 1 is mounted within the boxed region closest to O,

which is at object distance $$p_1$$. Lens 2 is mounted within the middle boxed region, at distance $$d_{12}$$ from lensLens 3 is mounted in

the farthest boxed region, at distance $$d_{23}$$ from lensEach problem in Table refers to a different combination of lenses and

different values for distances, which are given in centimeters. The

type of lens is indicated by C for converging and D for diverging;

the number after C or D is the distance between a lens and either

of the focal points (the proper sign of the focal distance is not

indicated).

Find (a) the image distance $$i_3$$ for the (final) image produced by

lens 3 (the final image produced by

the system) and (b) the overall lateral magnification M for the system,

including signs. Also, determine

whether the final image is (c) real

(R) or virtual (V), (d) inverted (I)

from object O or noninverted (NI), and (e) on the same side of

lens 3 as object O or on the opposite side.

(a) the angle $$ \alpha $$ is the least

$$\frac{1} {f} = \frac{1} {v} + \frac{1} {u}$$

Derive the formula of relation between radius of curvature ($$R$$), object distance ($$u$$) and image distance ($$v$$) for spherical mirrors.

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