Light Test

Result

Light Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements are correct regarding the image formed by a concave lens?

(i) The nature of image does not change much with the change in the object distance.
(ii) Always a virtual image is formed.
(iii) The image is larger in size.
(iv) Image is never formed between the optical centre and the focus.

A
Only (i), (ii) and (iii)

B
Only (i) and (ii)

C
Only (iii) and (iv)

D
Only (ii), (iii) and (iv)
Question 2
1 / -0

If a person wants to see an enlarged image of the object by using a convex lens then the lens must be held

A
Close to the object so that the object lies within the focal length of the lens

B
Far from the object so that the object lies beyond 2F

C
At infinity

D
Far from the object so that the object lies at 2F.

Solution

When the object is placed within the focal length of the lens, the image is formed on the same side as the object. It is virtual, erect and magnified.
Question 3
1 / -0

A prism splits up light into different colours but a glass slab does not show dispersion because

A
The emergent ray is deviated from the direction of the incident ray by the angle of deviation

B
The incident and emergent rays are parallel to each other

C
The emergent ray is laterally displaced from glass slab and changes its direction

D
The incident and emergent rays are not parallel to each other

Solution

Dispersion occurs when light is passed through a prism due to the difference in the angle of deviation for different colours. The opposite sides of a glass slab are parallel and therefore different colors emerge parallel to each other and are seen simultaneously.
Question 4
1 / -0

For the myopic eye, the defect is cured by

A
Convex lens

B
Concave lens

C
Cylindrical lens

D
None of these.

Solution

Myopia can be corrected by using spectacles with concave lenses of the required power.