Ray Optics Test

Result

Ray Optics Test - 55

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Weekly Quiz Competition

Question 1
4 / -1

Under which of the following conditions will a convex mirror of focal length f produce an image that is erect, diminished and virtual

A
Only when 2f > u > f

B
Only when u = f

C
Only when u < f

D
Always
Question 2
4 / -1

An object 2.5 cm high is placed at a distance of 10 cm from a concave mirror of radius of curvature 30 cm. The size of the image is

A
9.2 cm

B
10.5 cm

C
5.6 cm

D
7.5 cm

Solution
Question 3
4 / -1

An object moving at a speed of 5 m/s towards a concave mirror of focal length f = 1m is at a distance of 9 m. The average speed of the image is

A

B

C

D

Solution
Question 4
4 / -1

For unit magnification, the distance of an object from a concave mirror of focal length 20 cm will be

A
20 cm

B
10 cm

C
40 cm

D
60 cm

Solution
Question 5
4 / -1

To an observer on the earth the stars appear to twinkle. This can be ascribed to

A
The fact that stars do not emit light continuously

B
Frequent absorption of star light by their own atmosphere

C
Frequent absorption of star light by the earth's atmosphere

D
The refractive index fluctuations in the earth's atmosphere
Question 6
4 / -1

The ratio of the refractive index of red light to blue light in air is

A
Less than unity

B
Equal to unity

C
Greater than unity

D
Less as well as greater than unity depending upon the experimental arrangement

Solution
Question 7
4 / -1

The refractive index of a piece of transparent quartz is the greatest for

A
Red light

B
Violet light

C
Green light

D
Yellow light

Solution
Question 8
4 / -1

The refractive index of a certain glass is 1.5 for light whose wavelength in vacuum is 6000 A. The wavelength of this light when it passes through glass is

A
4000 Å

B
6000 Å

C
9000 Å

D
15000 Å

Solution
Question 9
4 / -1

When light travels from one medium to the other of which the refractive index is different, then which of the following will change

A
Frequency, wavelength and velocity

B
Frequency and wavelength

C
Frequency and velocity

D
Wavelength and velocity
Question 10
4 / -1

When light wave suffer reflection at the interface between air and glass, the change of phase of reflected wave is equal to

A
Zero

B
π/2

C
π

D
2π