Light Reflectio...

An object is placed first at infinity and then at $$20\ cm$$ from the object side focal plane of the convex lens. The two images thus formed are $$5\ cm$$ apart. The focal length of the lens is:

When a glass rod is immersed in a liquid of same refractive index, it will _____.

When a beam of light goes from a denser medium $$ \left(\mu_{d}\right)  $$ to a rarer medium ( $$  \mu_{r} ),  $$ then it is generally observed that magnitude of angle of incidence is half that of angle of refraction. Then magnitude of incident angle will be - (here $$  \mu=\mu_{d} / \mu_{r} )  $$

At what distance a person should face a concave mirror of focal length $$0.4 \ m$$ so that magnification is 5 times for a virtual image

A ray of light is incident on the surface of transparent medium at an angle of $$45^o$$ and is refracted in the medium at an angle of $$30^o$$. What will be the velocity of light in the transparent medium ? 

An object is placed at the principal focus of a convex mirror. The image will be at?

A Point source of Light is placed $$4 \ m$$ below the surface of water of refractive index $$\dfrac{5}{3}$$. the minimum diameter of a disc which should be placed over the source on the surface of water to cut-off all light coming out of water is: (μ=5/3) 

An object is placed at a distance of $$20$$cm from the pole of a concave mirror of focal length $$10$$cm. The distance of the image formed is?

A candle placed $$25$$cm from a lens forms an image on a screen placed $$75$$cm on the other side of the lens. The focal length and type of the lens should be?

Calculate the refractive index of glass with respect to water. It is given that refractive indices of glass and water with respect to air are $$\dfrac {3}{2}$$ and $$\dfrac {4}{3}$$ respectively.