Optics

Q2. The sky appears red because blue light is scattered less.

Q3. A concave lens is thicker at the centre than at the edges.

Q4. A convex lens converges parallel light rays.

Q5. Myopia can be corrected using a convex lens.

Q6. Optical fibre works on the principle of total internal reflection.

Q7. Reflection is the return of light into the same medium after striking a surface.

Q8. A convex lens is a diverging lens.

Q9. The focal length of a lens is related to its optical power.

Q10. The unit of lens power is dioptre.