Question

lens formula 5 marks​

Answer 1

Answer:

The object is u = 6cm away from a convex lens of focal length f = 2 cm. The image position can be found from the lens equation 1 6 + 1 v = 1 2 , ∴ 1 v = 1 2 − 1 6 = 3 6 − 1 6 = 1 3 .

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Answer 2

LENS FORMULA

A lens formula may be defined as the formula which gives the relationship between the distance of image (v), distance of object (u), and the focal length (f) of the lens. It may be written as: 1/v-1/u=1/f

Principal Axis Concave Lens

Where, v = Distance of image from optical centre of lens

u = Distance of object from optical centre of lens

and f = Focal length of lens

The lens formula is applicable both in convex lenses and concave lenses.