COMEDK 2024 Evening Shift | Ray Optics Question 3 | Physics

When a biconvex lens of glass of refractive index 1.5 is dipped in a liquid, it acts like a plane sheet of paper. This means the refractive index of the liquid is

Greater than that of glass

Less than that of glass

Equal to that of glass

Less than one

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

A hollow prism is filled with water and placed in air. It will deviate the incident rays

Towards or away from the base

Away from the base

Parallel to the base

Towards the base

COMEDK 2024 Morning Shift

MCQ (Single Correct Answer)

-0

In the normal adjustment of an astronomical telescope, the objective and eyepiece are $$32 \mathrm{~cm}$$ apart. If the magnifying power of the telescope is 7, find the focal lengths of the objective and eyepiece.

$$\mathrm{f}_{\mathrm{o}}=7 \mathrm{~cm}$$ and $$\mathrm{f}_{\mathrm{e}}=28 \mathrm{~cm}$$

$$f_o=28 \mathrm{~cm}$$ and $$f_e=7 \mathrm{~cm}$$

$$\mathrm{f}_{\mathrm{e}}=28 \mathrm{~cm}$$ and $$\mathrm{f}_{\mathrm{o}}=4 \mathrm{~cm}$$

$$f_o=28 \mathrm{~cm}$$ and $$f_e=4 \mathrm{~cm}$$

COMEDK 2024 Morning Shift

MCQ (Single Correct Answer)

-0

When a particular wave length of light is used the focal length of a convex mirror is found to be $$10 \mathrm{~cm}$$. If the wave length of the incident light is doubled keeping the area of the mirror constant, the focal length of the mirror will be:

5 cm

20 cm

15 cm

10 cm

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