Question

A student obtained a sharp image of a candle flame placed at the distant end of the laboratory table on a screen using a concave mirror to determine its focal length. The teacher suggested him to focus a distant building about 1 km far from the laboratory, for getting more correct value of the focal length. In order to focus the distant building on the same screen the student should slightly move the : (a) mirror away from the screen (b) screen away from the mirror (c) screen towards the mirror (d) screen towards the building

Answer 1

Explanation:

screen towards the mirror

Answer 2

Dear Student,

◆ Answer -

(c) screen towards the mirror

● Explaination -

• In case of concave mirror, image distance decreases with increase in object distance.
• As we change object from candle flame to distant tree, object distance increases.
• So in order to reduce the image distance, screen has to be moved towards mirror.

Thanks dear. Hope I was useful..