Question

3. What is the significance of concave mirror in an electric torch? short​

Answer 1

Required Answer:-

• A concave mirror is used up in a torch. The bulb of this torch is placed at the focus of this mirror. Hence, the light rays are reflected parallel to each other when the torch us switched on and the image is formed at the infinity.
• Formation of image at Infinity in this case represents that the light travels a long distance in order to provide more light.

For the Ray diagram refer to the attachment !!

In the diagram:-

• AB is the bulb placed at focus
• image is formed at infinity which is highly enlarged and real & inverted

Note:- while drawing the Ray diagram, do remember to mark the arrows.