Ray Optics Test

Result

Ray Optics Test - 92

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Weekly Quiz Competition

Question 1
4 / -1

A simple magnifying lens is used in such a way that an image is formed at 25 cm away from the eye. In order to have 10 times magnification, the focal length of the lens should be

A
5 cm

B
2 cm

C
25 mm

D
0.1mm

Solution
Question 2
4 / -1

A telescope of diameter 2m uses light of wavelength 5000 Å for viewing stars. The minimum angular separation between two stars whose image is just resolved by this telescope is

A
4 × 10^–4 rad

B
0.25 × 10^–6 rad

C
0.31 × 10^–6 rad

D
5.0 × 10^–3 rad

Solution
Question 3
4 / -1

In Gallilean telescope, if the powers of an objective and eye lens are respectively +1.25 D and –20 D, then for relaxed vision, the length and magnification will be

A
21.25 cm and 16

B
75 cm and 20

C
75 cm and 16

D
8.5 cm and 21.25

Solution
Question 4
4 / -1

The aperture of a telescope is made large, because

A
To increase the intensity of image

B
To decrease the intensity of image

C
To have greater magnification

D
To have lesser resolution
Question 5
4 / -1

A Galileo telescope has an objective of focal length 100cm and magnifying power 50. The distance between the two lenses in normal adjustment will be

A
96 cm

B
98 cm

C
102 cm

D
104 cm

Solution
Question 6
4 / -1

To increase both the resolving power and magnifyingpower of a telescope

A
Both the focal length and aperture of the objective has to be increased

B
The focal length of the objective has to be increased

C
The aperture of the objective has to be increased

D
The wavelength of light has to be decreased
Question 7
4 / -1

A telescope has an objective of focal length 50 cm and an eye piece of focal length 5 cm. The least distance of distinct vision is 25 cm. The telescope is focused for distinct vision on a scale 200 cm away. The separation between the objective and the eye-piece is

A
75 cm

B
60 cm

C
71 cm

D
74 cm

Solution
Question 8
4 / -1

A opera glass (Gallilean telescope) measure 9 cm from the objective to the eyepiece. The focal length of the objective is 15 cm. Its magnifying power is

A
2.5

B
2/5

C
5/3

D
0.4

Solution
Question 9
4 / -1

The aperture of the objective lens of a telescope ismade large so as to

A
Increase the magnifying power of the telescope

B
Increase the resolving power of the telescope

C
Make image aberration less

D
Focus on distant objects

Solution
Question 10
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