Fill ups
A lay of light parallel to the principal axis after reflection from a concave mirror passes through…………. .

Explain how a parallel beam of light on reflection from a concave mirror gets converged.

Explain how a parallel beam of light on reflection from a convex mirror gets diverged.

A ray of light moving parallel to the x-axis gets reflected form a parabolic mirror whose equation is (y-2)^2=4(x+1) . Find the point on the axis of the parabola through which the ray must pass after reflection.

A convex lens of focal lenght 20 cm is placed coaxially with a concave mirror of focal length 10 cm at a distance of 50 cm apart from each other.A beam of ligh coming parallel to the principal axis is incident on the convex lens.Find the position diagram showing the formation of the imge.

Parallel rays incident on a mirror,after reflection converge at a point, then the mrirror will be …… .

A ray of light passing through the point (1, 2) reflects on the x-axis at point A and the reflected ray passes through the point (5, 3). Find the coordinates of A.

A ray of light is coming along the line y=b from the positive direction of x-axis and striks a concave mirror whose intersection with x-plane is a parabola y^2 = 4ax . Find the equation of the reflected ray and show that it passes through the focus of the parabola. Both a and b are positive.

A 5 cm long needle lies along the principal axis axis of a concave miror of focal length 20 cm in such a way that the end closer to the pole is 40 cm from it.Find the length of the image of the needle formed by the mirror.

A ray of light travelling along the line x+y=1 is incident on the X - axis and after refraction the other side of the X - axis by turning pi//6 by turning away from the X - axis .The equation of the line along which the refracted ray travels is