Spherical Lenses

What is the focus of concave lens?

Is the focus of a concave lens negative?

Why concave lens has virtual focus?

What is the focus of concave lens?

Which lens diverges the light rays falling on it?

Which lens is used as a magnifying glass - convex lens or concave lens?

A bi-convex lens converges the parallel rays on the principal axis at $10 \mathrm{cm}$, then focal length is

A convex lens diverges the rays of light passing through it whereas a concave lens converges the rays of light passing through it.

The_____image is always inverted.

A convex lens is made of a material of refractive index µ _1. When placed in a medium of refractive index  µ₂ , this lens behaves as a diverging lens. How are µ₁ and µ₂  related ?

An inverted and real image of a needle is formed with a convex lens at a distance of 40 cm from the lens. What would be the position of the needle placed in front of the lens if the image is equal to the size of the object?

Find the focal length of a lens of power -2.0 D. 

Where should an object be placed in front of a convex lens to get a real image of the size of the object?

_____(5/6) images of himself can an observer see in a room whose ceiling and two adjacent walls are mirrors?

_____is the S.I unit of power of  a lens.

Which one the following materials can not be used to make a lens?

What is the focal length and power of the combination of a convex lens of focal length $40 \mathrm{cm}$ placed in a contact with a concave lens of focal length $20 \mathrm{cm}$?

The image formed by a pin hole camera is sharpest when the

Abberations can be corrected by combining convex lens with concave lens.

Focal point is the point at which the light rays converges after passing through the lens.