Ray Optics Test

Result

Ray Optics Test - 88

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Weekly Quiz Competition

Question 1
4 / -1

The focal lengths of the objective and eye-lens of a microscope are 1 cm and 5 cm respectively. If the magnifying power for the relaxed eye is 45, then the length of the tube is

A
30 cm

B
25 cm

C
15 cm

D
12 cm

Solution
Question 2
4 / -1

The magnifying power of telescope is high if

A
Both objective and eye-piece have short focal length

B
Both objective and eye-piece have long focal length

C
The objective has a long focal length and the eye piece has a short focal length.

D
The objective has a short focal length and the eye piece has a long focal length.
Question 3
4 / -1

The focal length of the objective lens of a compound microscope is

A
Equal to the focal length of its eye piece

B
Less than the focal length of eye piece

C
Greater than the focal length of eye piece

D
Any of the above three

Solution
Question 4
4 / -1

Microscope is an optical instrument which

A
Enlarges the object

B
Increases the visual angle formed by the object at the eye

C
Decreases the visual angle formed by the object at the eye

D
Brings the object nearer
Question 5
4 / -1

Magnifying power of a simple microscope is (when final image is formed at D = 25 cm from eye)

A

B

C

D
Question 6
4 / -1

If in compound microscope m₁ and m₂ be the linear magnification of the objective lens and eye lens respectively, then magnifying power of the compound microscope will be

A

B

C

D

Solution
Question 7
4 / -1

For which of the following colour, the magnifying power of a microscope will be maximum

A
White colour

B
Red colour

C
Violet colour

D
Yellow colour

Solution
Question 8
4 / -1

If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25 cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is

A
150

B
200

C
250

D
400

Solution
Question 9
4 / -1

An experiment is performed to find the refractive index of glass using a travelling microscope. In thisexperiment distances are measured by

A
A standard laboratory scale

B
A metre scale provided on the microscope

C
A screw gauge provided on the microscope

D
A vernier scale provided on the microscope
Question 10
4 / -1

When the length of a microscope tube increases, its magnifying power

A
Decreases

B
Increases

C
Does not change

D
May decrease or increase

Solution