Ray Optics Test

Result

Ray Optics Test - 93

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Weekly Quiz Competition

Question 1
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 2
4 / -1

All of the following statements are correct except

A
The total length of an astronomical telescope is the sum of the focal lengths of its two lenses

B
The image formed by the astronomical telescope is always erect because the effect of the combination of the two lenses is divergent

C
The magnification of an astronomical telescope can be increased by decreasing the focal length of the eye-piece

D
The magnifying power of the refracting type of astronomical telescope is the ratio of the focal length of the objective to that of the eye-piece
Question 3
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
3 f

D
4f
Question 4
4 / -1

The length of an astronomical telescope for normal vision (relaxed eye) f₀ = focal length of objective lens and f_e = focal length of eye lens) is

A

B

C

D
Question 5
4 / -1

A Gallilean telescope has objective and eye-piece 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 6
4 / -1

The resolving power of a telescope depends on

A
Focal length of eye lens

B
Focal length of objective lens

C
Length of the telescope

D
Diameter of the objective lens

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 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 9
4 / -1

The astronomical telescope consists of objective and eyepiece. The focal length of the objective is

A
Equal to that of the eye-piece

B
Greater than that of the eye-piece

C
Shorter than that of the eye-piece

D
Five times shorter than that of the eye-piece

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