Question 1 What is a lens? Question 2 How many type of lens are them? Question 3 What is a convex lens? Question 4 What is a concave lens? Question 5 Draw Bi-convex,plane-convex and concavo-convex lens? Question 6 Draw Bi-concave,plane-concave and convexo-concave lens? Refraction by spherical lenses Lens is a transparent medium bounded by two refracting … [Read more...] about Refraction by spherical lenses