A point source of light is placed in front of a plane mirror.

Total internal reflection can take place only if

In image formation from spherical mirrors, only paraxial rays are considered because they

A point object is placed at a distance of 30 cm from a convex mirror of focal length 30 cm. The image will form at

Figure (18-Q2) shows two rays A and B being reflected by a mirror and going as A’ and B’. The mirror

The image formed by a concave mirror

Figure (18-Q3) shows three transparent media of refractive indices μ1, μ2 and μ3. A point object O is placed in the medium μ2. If the entire medium on the right of the spherical surface has refractive index μ₁, the image forms at O’. If this entire medium has refractive index μ₃, the image forms at O’’. In the situation shown,

Four modifications are suggested in the lens formula to include the effect of the thickness t of the lens. Which one is likely to be correct?

A double convex lens has two surfaces of equal radii R and refractive index m=1.5. We have,

A point source of light is placed at a distance of 2f from a converging lens of focal length f. The intensity on the other side of the lens is maximum at a distance

A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side on its principal axis, the intensity of light

A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4 D, the power of a divided lens will be

A symmetric double convex lens is cut in two equal parts by a plane containing the principal axis. If the power of the original lens was 4 D, the power of a divided lens will be

Two concave lenses L₁ and L₂ are kept in contact with each other. If the space between the two lenses is filled with a material of smaller refractive index, the magnitude of the focal length of the combination

A thin lens is made with a material having refractive index μ = 1.5. Both the surfaces of the lens are convex. It is dipped in water (μ = 1.33). It will behave like

A convex lens is made of a material having refractive index 1.2. Both the surfaces of the lens are convex. If it is dipped into water (μ = 1.33), it will behave like

A point object O is placed on the principal axis of a convex lens of focal length f= 20 cm at a distance of 40 cm to the left of it. The diameter of the lens is 10 cm. An eye is placed 60 cm to right of the lens and a distance h below the principal axis. The maximum value of h to see the image is

The rays of different colours fail to converge at a point after going through a converging lens. This defect is called