A plano-concave lens is placed on a paper on which a flower is drawn. How far above its actual position does the flower appear to be?

A plano concave lens is silvered at the plane surface. How does it behave?

Explain why does an underwater object appears to be situated above its actual position.

If the lens is placed in water instead of air, how does its focal length change?

A hemispherieal paper weight contains a small flower on its axis of symmetry at a distance of 4 cm from its flat surface. Where is the flower appears to an observer when he looks at it along the axis of symmetry from the top? (Index of refraction of glass = 1.5)

A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen?

A concave mirror of focal length 10 cm is placed at a distance of 35 cm from a wall. How far from the wall should an object be placed to get its image on the wall ?

A concave mirror of focal length 10 cm is placed at a distance of 35 cm from a wall. How far from the wall should an object be placed to get its image on the wall ?

Which part of a flower does protect its reproductive organs within a bud?