KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 7 - 9 of 250

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Question number: 7

» Ray Optics » Total Internal Reflection

Appeared in Year: 2010

MCQ▾

Question

A point source of light is placed at the bottom of a vessel which is filled with water of refractive index μ to a height h. If a floating opaque disc has to be placed exactly above it so that the source is invisible from above, the radius of the disc should be –

Choices

Choice (4) Response
a.

hμ21

b.

hμ1

c.

hμ21

d.

μhμ21

Question number: 8

» Wave Optics » Malus' Law and Its Application

Appeared in Year: 2011

MCQ▾

Question

A plane polarized light passed through successive polarizers which are rotated by 300 with respect to each other in the clockwise direction. Neglecting absorption by the polarizers and given that the first polarizer’s axis is parallel to the plane of polarization of the incident light, the intensity of light at the exit of the fifth polarizer is closest to –

Choices

Choice (4) Response
a.

17.5 % of the incident light

b.

30 % of the incident light

c.

Zero

d.

Same as that of the incident light

Question number: 9

» Ray Optics » Snell's Law

Appeared in Year: 2010

MCQ▾

Question

Three transparent media of refractive indices µ1, µ2, µ3 respectively, are stacked as shown. A ray of light follows the path shown. No light enters the third medium.

 Beam of light passing through three transparent mediums

Beam of Light Passing Through Three Transparent Mediums

In figure path of a ray of light passing through three mediums having different refractive indexes is shown.

Then-

Choices

Choice (4) Response
a.

µ1<µ3<µ2

b.

µ2<µ1<µ3

c.

µ3<µ1<µ2

d.

µ1<µ2<µ3

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