Ray Optics Test

Result

Ray Optics Test - 150

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Weekly Quiz Competition

Question 1
4 / -1

On which of the following does the magnifying power of a telescope depends

A
The focal length of the objective only

B
The diameter of aperture of the objective only

C
The focal length of the objective and that of the eye piece

D
The diameter of aperture of the objective and that of the eye piece

Solution
Question 2
4 / -1

Large aperture of telescope are used for

A
Large image

B
Greater resolution

C
Reducing lens aberration

D
Ease of manufacture

Solution
Question 3
4 / -1

Two convex lenses of focal lengths 0.3 m and 0.05 m are used to make a telescope. The distance kept between the two is

A
0.35 m

B
0.25 m

C
0.175 m

D
0.15 m

Solution
Question 4
4 / -1

The diameter of the objective lens of a telescope is 5.0 m and wavelength of light is 6000 Å. The limit of resolution of this telescope will be

A
0.03 sec

B
3.03 sec

C
0.06 sec

D
0.15 sec

Solution
Question 5
4 / -1

A terrestrial telescope is made by introducing an erecting lens of focal length f between the objective and eye piece lenses of an astronomical telescope. This causes the length of the telescope tube to increase by an amount equal to

A
f

B
2f

C
3f

D
4f
Question 6
4 / -1

A Gallilean telescope has objective and eyepiece of focal lengths 200 cm and 2 cm respectively. The magnifying power of the telescope for normal vision is

A
90

B
100

C
108

D
198

Solution
Question 7
4 / -1

When diameter of the aperture of the objective of an astronomical telescope is increased, its

A
Magnifying power is increased and resolving power is decreased

B
Magnifying power and resolving power both are increased

C
Magnifying power remains the same but resolving power is increased

D
Magnifying power and resolving power both are decreased
Question 8
4 / -1

The focal lengths of the objective and eye lenses of a telescope are respectively 200 cm and 5 cm. The maximum magnifying power of the telescope will be

A
–40

B
–48

C
–60

D
–100

Solution
Question 9
4 / -1

The minimum magnifying power of a telescope is M, If the focal length of its eye lens is halved, the magnifying power, will become

A
M/2

B
2 M

C
3 M

D
4 M

Solution
Question 10
4 / -1

Four convergent lenses have focal lengths 100 cm, 10 cm, 4 cm and 0.3 cm. For a telescope with maximum possible magnification, we choose the lenses of focal length

A
100 cm, 0.3 cm

B
10 cm, 0.3 cm

C
10 cm, 4 cm

D
100 cm, 4 cm

Solution