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1. Differentiate convex lens and concave lens.
a. A convex lens is  at the edges.
b. A concave lens is  at the edges.
2. What is power of accommodation of eye?
a. The ratio of the sine of the angle of incidence and sine of the angle of refraction is equal to the ratio of .
b. Refractive index is denoted by the symbol
3. What are the causes of ‘Myopia’?
a. Myopia is a condition that affects .
b. Myopia also known as