Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case.

The electronic configuration of an element 'X' is 2,8,8,2. Write its (i) group number, (ii) period number and (iii) the number of valence electrons in its atom. Justify your answer in each case.

Mention the types of mirrors used as (i) rear view mirrors, (ii) shaving mirrors. List two reasons to justify your answers in each case.

Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in figure.

It is established that an electric current through a conductor produces a magnetic field arount it . Is there a similar magnetic field produced around a thin beam of moving (i) alpha particles, (ii) neutrons ? Justify your answer in each case .

Draw suitable diagrams to illustrate the action of (i) concave mirror, and (ii) convex mirror, on a beam of light incident parallel to the principal axis.

For the circuit would the balancing length increase, decrease or remain the same if (i) R_(1) is decreased (ii) R_(2) is increased, without any change (in each case) in the rest of the circuit ? Justify your answer in each case.

Which of the following ray diagrams is correct for the ray of light incident on a lens shown in Fig. ? Choices are given in Fig.

L is a lens such that a parallel beam of light I ncident on it, after refraction, converges to a point at a distance x from it and M is a mirror such that a parallel lbeam of light incident on it, after reflection, converges to a point at a distance y from it. Now the lens L and mirror M are placed at a distan 2(x+y) from each other. An object of size 2 cm is kept infront of lens at a distance 2x from it. Find the nature, position , and size of the image that willl be seen by an observer looking toward the mirror through the lens.

Draw the following diagram, in which a ray of light is incident on a concave/convex mirror, on your answer sheet . Show the path of this ray, after reflection, in each case.

Two plane mirror are inclined to each other at 90^(@) . A ray of light is incident on one mirror. The ray will undergo a total deviation of