1
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 $$f_e=4 \mathrm{~cm}$$
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-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:

A
5 cm
B
20 cm
C
15 cm
D
10 cm
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

For a $$30^{\circ}$$ prism when a ray of light is incident at an angle $$60^{\circ}$$ on one of its faces, the emergent ray passes normal to the other surface. Then the refractive index of the prism is:

A
$$\sqrt{3}$$
B
$$\frac{\sqrt{3}}{2}$$
C
1.5
D
1.33
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A ray of light travelling through a medium of refractive index $$\frac{5}{4}$$ is incident on a glass of refractive index $$\frac{3}{2}$$. Find the angle of refraction in the glass, if the angle of incidence at the given medium - glass interface is $$30^{\circ}$$.

A
$$\sin ^{-1}\left(\frac{1}{2}\right)$$
B
$$\sin ^{-1}\left(\frac{1}{3}\right)$$
C
$$\sin ^{-1}\left(\frac{5}{12}\right)$$
D
$$\sin ^{-1}\left(\frac{6}{5}\right)$$
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