Question

1. Define critical angle?
2. Write lens formula and explain the terms in it?
3. Doctor Advised to use 2D Lens. Find it's focal length ?​

Answer 1

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.

1.the critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees. Make particular note that the critical angle is an angle of incidence value. For the water-air boundary, the critical angle is 48.6-degrees.

3.We know, Power is the reciprocal of focal length in metres. Hence, it will be a convex lens of focal length 50 cm .

Answer 2

Answer:

Explanation:

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