COMEDK 2024 Afternoon Shift | Ray Optics Question 19 | Physics

Light enters at an angle of incidence in a transparent rod of refractive index '$$n$$'. The least value of '$$n$$' for which the light once entered into it will not leave it through its lateral face whatsoever be the value of the angle of incidence is

$$\sqrt{2}$$

1.5

1.3

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

COMEDK 2024 Morning Shift

MCQ (Single Correct Answer)

-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:

$$\sqrt{3}$$

$$\frac{\sqrt{3}}{2}$$

1.5

1.33

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