Ray Optics and Optical Test

Result

Ray Optics and Optical Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

Light rays from a point object

A
radiate in some lines

B
radiate only at the front

C
radiate in all directions

D
radiate only to the side

Solution

light waves emerging from point source radiates in all the directions.
Question 2
1 / -0

Focal length of a mirror is given by

A
f = R/2, R = radius of curvature

B
f = R/4, R = radius of curvature

C
f = R, R = radius of curvature

D
f = R², R = radius of curvature

Solution

R=2f = 2(focal length)
Question 3
1 / -0

Refraction is

A
Change of direction of propagation of light at the interface of two media as light passes from one medium to another

B
Reversal of direction of propagation of light

C
The change in frequency of light

D
None of these

Solution

Refraction is a phenomenon that often occurs when light travel from a medium with a given refractive index to a medium with another at an oblique angle. At the boundary between the media, velocity of light is altered, usually causing a change in direction.
Question 4
1 / -0

According to Snell’s law

A
The ratio of the cosine of the angle of incidence to the cosine of angle of refraction is constant

B
The ratio of the tangent of the angle of incidence to the tangent of angle of refraction is constant

C
The ratio of the angle of incidence to the angle of refraction is constant

D
The ratio of the sine of the angle of incidence to the sine of angle of refraction is constant

Solution

The ratio of sine of angle of incidence and sine of angle of refraction is constant for a given pair of media for a given wavelength of light.
Question 5
1 / -0

For a rectangular slab, refraction takes place at

A
Four interfaces

B
One interface

C
Two interfaces

D
Three interfaces

Solution

At one surface, light enters from air into glass and at the other surface light enters from glass into air.
Question 6
1 / -0

Total internal reflection can take place only if light is travelling from

A
Rarer to denser medium

B
Any two media

C
No two media

D
Denser to rarer medium
Solution
Conditions for TIR are:
1. Light should travel from denser medium to rarer medium
2. Angle of incidence > critical angle.

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Re-Attempt Weekly Quiz Competition

Ray Optics and Optical Test - 3

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Ray Optics and Optical Test - 3

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SHARING IS CARING

Question 1

radiate in some lines

radiate only at the front

radiate in all directions

radiate only to the side

Solution

Question 2

f = R/2, R = radius of curvature

f = R/4, R = radius of curvature

f = R, R = radius of curvature

f = R2, R = radius of curvature

Solution

Question 3

Change of direction of propagation of light at the interface of two media as light passes from one medium to another

Reversal of direction of propagation of light

The change in frequency of light

None of these

Solution

Question 4

The ratio of the cosine of the angle of incidence to the cosine of angle of refraction is constant

The ratio of the tangent of the angle of incidence to the tangent of angle of refraction is constant

The ratio of the angle of incidence to the angle of refraction is constant

The ratio of the sine of the angle of incidence to the sine of angle of refraction is constant

Solution

Question 5

Four interfaces

One interface

Two interfaces

Three interfaces

Solution

Question 6

Rarer to denser medium

Any two media

No two media

Denser to rarer medium

Solution

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f = R², R = radius of curvature