Ray Optics (NEET Physics): Questions 27 - 30 of 102

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Question number: 27

» Ray Optics » Magnification

MCQ▾

Question

The relation between the linear magnification m, the object distance u and the focal length f for a spherical mirror is

Choices

Choice (4) Response

a.

m=ffu

b.

m=fuf

c.

m=ff+u

d.

m=f+uf

Question number: 28

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

MCQ▾

Question

A plane mirror reflecting a ray of incident light is rotated through an angle θ about an axis through the point of incidence in the plane of the mirror perpendicular to the plane of incidence, then

(1) The reflected ray rotates through an angle 2θ

(2) The incident ray is fixed

(3) The reflected ray does not rotate

(4) The reflected ray rotates through an angle 0

Select the correct answers and mark it according to the following codes:

Codes:

Choices

Choice (4) Response

a.

2 and 4 are correct

b.

1 and 3 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

Question number: 29

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

MCQ▾

Question

A completely transparent material will be invisible in vacuum if its refractive index is,

Choices

Choice (4) Response

a.

Unity

b.

Equal to1.33

c.

Greater than unity

d.

Less than unity

Question number: 30

» Ray Optics » Snell's Law

MCQ▾

Question

Light from a sodium lamp (λ 0 = 589 nm) passes through a tank of glycerin (refractive index 1.47) 20 m long in a time t 1. If it takes a time to traverse the same tank when filled with carbon disulphide (index 1.63), then the difference t 2 - t 1 is,

Choices

Choice (4) Response

a.

6.67 × 10 -8 sec

b.

2.07 × 10 -7 sec

c.

1.09 × 10 -7 sec

d.

1.07 × 10 -8 sec

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