Sonu observes that the image of a candle flame placed at a distance of 60 cm from a spherical lens is formed on a screen placed on the other side of the lens at a distance of .0 cm from the optical centre of the lens. Few questions came to her mind. Give answers to the below questions.
1. What is the type of the lens ?
(i) Convex lens
(ii) Concave lens
2. What is the focal length of the lens?
(i) 10 cm
(ii) 20 cm
3. If the height of the flame is 3 cm, find the height of its image.
(i) -6 cm
(ii) -2 cm
4. What is the formula for finding the focal length of the lens?
(i) \(\frac{1}{P^2}\)
(ii) \(\frac1P\)
(iii) P
5. What is the magnification of convex lens?
(i) -2
(ii) -9
