Light Reflectio...

A pin of length $$2\ cm$$ along the principle axis of a converging lens, the centre being at a distance of $$11\ cm$$ from the lens. The focal length of the lens is $$6\ cm$$. Find the size of the image ?

An object placed in front of a concave mirror of  focal length $$0.15\ m$$ produces a virtual image, which is twice the size of the object. The position of the object with respect to the mirror is :

A ray of light travels from water to glass as shown below. The refractive index of water is $$1.3$$ and the refractive index of glass is $$1.5$$. What is the angle of refraction ?

Which mirror is to be used to obtain a parallel beam of light from a point source?

A film projector magnifies a film of area $$100 $$ square centimeter on screen. If linear magnification is $$4$$ then area of magnified image on screen will be-

An object is placed at a distance of $$16 cm$$ from a convex mirror of focal length $$20 cm$$, the position of image with its nature is 

The focal length of a concave mirror is $$50 \ cm$$. Where should an object be placed, so that its image is two times and is inverted

A real object is placed at $$20 \ cm$$ from a concave mirror of focal length $$5 \ cm$$. Find the magnification.

The image formed by a convex mirror of focal length $$30\ cm$$ is a quarter of the size of the object. The distance of the object from the mirror is 

For water $$\mu = \dfrac{4}{3}$$ and the velocity of light in vacuum is $$3 \times 10^8 m/s$$, the time taken for light to travel a distance of $$450\ m$$ in water will be.