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Two plano convex lenses each of focal length 10 cm and refrective index 3/2 are placed as shown in the space left water (ri=4/3) id filled thd whole arrangment is in air the optical power of the system is (in diopters)
for the focal length of lens given that F = 10 cm now by lens maker's formula R = 5 cm First of all if a parallel beam of light incident on the flat surface of lens then the lens will converge the light at its focus this position is given us at 10 cm. now this image will behave like an object for water surface which is curved by radius R = 5cm now for curved surface refraction so whole combination of lens will converge the light at 40 cm so power of the system is given as so power will be 2.5D
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