Ray Optics (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 11 - 13 of 13

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Question number: 11

» Ray Optics » Snell's Law

Appeared in Year: 2015

MCQ▾

Question

A cubical vessel has opaque walls. An observer (dark circle in figure below) is located such that she can see only the all CD but not the bottom. Nearly to what height should water be poured so that she can see an object placed at the bottom at a distance of 10 cm from the corner C? Refractive index of water is 1.33.

A cubic vessel has opaque wall

A Cubic Vessel Has Opaque Wall

In figure a cubic vessel is shown, which has opaque wall. And dark circle represent observer.

Choices

Choice (4) Response

a.

10 cm

b.

45 cm

c.

27 cm

d.

16 cm

Question number: 12

» Ray Optics » Lens Maker's Formula and Lens Formula

MCQ▾

Question

The flat face of a Plano-convex lens of focal length 20 cm is silvered. A point source placed 50 cm in front of the curved surface will produced a –

Choices

Choice (4) Response

a.

Virtual image 12.5 cm away from the lens

b.

Real image 25 cm away from the lens

c.

Virtual image 25 cm away from the lens

d.

Real image 12.5 cm away from the lens

Question number: 13

» Ray Optics » Snell's Law

Appeared in Year: 2014

MCQ▾

Question

The angles of incidence and refraction of a monochromatic ray of light of wavelength λ at an air-glass interface are i and r, respectively. A parallel beam of light with a small spread δλ in wavelength about a mean wavelength λ is refracted at the same air-glass interface. The refractive index µ of glass depends on the wavelength λ as μ(λ)=a+bλ2 where a and b are constants. Then the angular spread in the angle of refraction of the beam is –

Choices

Choice (4) Response

a.

2b(a+bλ2)siniλ3δλ

b.

Siniλ3cosrδλ

c.

2btanraλ3+bλδλ

d.

2bλ3δλ

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