1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Figure below shows a lens of refractive index, $$\mu=1.4$$. $$C_1$$ and $$C_2$$ are the centres of curvature of the two faces of the lens of radii of curvature $$4 \mathrm{~cm}$$ and $$8 \mathrm{~cm}$$ respectively.

COMEDK 2024 Evening Shift Physics - Ray Optics Question 1 English

The lens behaves as a

A
diverging lens of focal length $$20 \mathrm{~cm}$$
B
converging lens of focal length $$20 \mathrm{~cm}$$
C
converging lens of focal length $$12 \mathrm{~cm}$$
D
diverging lens of focal length $$12 \mathrm{~cm}$$
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

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

A
Greater than that of glass
B
Less than that of glass
C
Equal to that of glass
D
Less than one
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

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

A
Towards or away from the base
B
Away from the base
C
Parallel to the base
D
Towards the base
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-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.

A
$$\mathrm{f}_{\mathrm{o}}=7 \mathrm{~cm}$$ and $$\mathrm{f}_{\mathrm{e}}=28 \mathrm{~cm}$$
B
$$f_o=28 \mathrm{~cm}$$ and $$f_e=7 \mathrm{~cm}$$
C
$$\mathrm{f}_{\mathrm{e}}=28 \mathrm{~cm}$$ and $$\mathrm{f}_{\mathrm{o}}=4 \mathrm{~cm}$$
D
$$f_o=28 \mathrm{~cm}$$ and $$f_e=4 \mathrm{~cm}$$
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