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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 cmnow by lens maker's formula R = 5 cmFirst of all if a parallel beam of light incident on the flat surface of lens then the lens will converge the light at its focusthis position is given us at 10 cm.now this image will behave like an object for water surface which is curved by radius R = 5cmnow for curved surface refraction so whole combination of lens will converge the light at 40 cmso power of the system is given as so power will be 2.5D
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