This defect is caused due to elongation of eye ball.

Convex lens is used to correct this defect.

bifocal lens is used to correct this defect.

• Myopia

• hypermetropia

• cataract

• presbyopia

this defect is also known as old age defect.

this problem arises due to foggy or cloudy lens .

• presbyopia

• myopia

• cataract

• hypermetropia

which colour bends the most on refraction through a triangular prism?

• red

• blue

• green

• violet

This phenomenon is responsible for rainbow formation.

• refraction

• dispersion

• internal reflection

• all of these

angle of deviation in a triangular prism is angle between

• incident ray and refracted ray.

• refracted ray and emergent ray.

• extended incident and emergent ray

• none of these