# Ray Optics (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 8 - 10 of 13

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## Question number: 8

» Ray Optics » Mirror Formula

Appeared in Year: 2014

MCQ▾

### Question

The flat face of a Plano-convex lens of focal length 10 cm is silvered. A point source placed 30 cm in front of the curved surface will produce a

### Choices

Choice (4) Response

a.

Real image 6 cm away from the lens

b.

Real image 15 cm away from the lens

c.

virtual image 15 cm away from the lens

d.

virtual image 6 cm away from the lens

## Question number: 9

» Ray Optics » Snell's Law

Appeared in Year: 2015

MCQ▾

### Question

Electromagnetic waves emanating from a point A (in air) are incident on a rectangular block of material M and emerge from the other side as shown. The angles i and r are angles of incidence and refraction when the wave travels from air to the medium. Such paths for the rays are possible

### Choices

Choice (4) Response

a.

only with gamma rays with a wavelength smaller than atomic nuclei of the material

b.

If the material has a refractive index less than zero

c.

If the material has a refractive index very nearly equal to zero

d.

only if the wave travels in M with a speed faster than the speed of light in vacuum.

## Question number: 10

» Ray Optics » Reflection and Refraction of Light » Spherical Surface

Appeared in Year: 2014

MCQ▾

### Question

A concave mirror of radius of curvature R has a circular outline of radius r. A circular disc is to be placed normal to the axis at the focus so that it collects all the light that is reflected from the mirror from a beam parallel to the axis. For r < < R, the area of this disc has to be at least,

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page