revision Grd 8

revision Grd 8

Poll

Concave mirror is a converging mirror

• true

• false

concave mirror - converging

Multiple Choice

geometric centre of a spherical mirror is called ______

• pole

• centre of curvature

Multiple Select

real image

• cannot be obtained on screen

• formed behind the mirror

• inverted

• rays of light actually meet

Multiple Choice

if incident ray passes through focus and falls on a spherical mirror then the reflected ray will be _________

• parallel to principal axis

• passing through centre of curvature

• passing through focus

Open Ended

Convex mirrors are used as rare view mirrors. give reason

Laws of Refraction (Snell’s Law) 

1)The incident ray, normal at the point of incidence and the refracted ray all lie in the same plane.

2)The ratio of the sine of angle of incidence to the sine of angle of refraction is a constant for a given pair of media.

The constant is called as Refractive index of the second medium w.r.t first medium.

Multiple Choice

when Ray of light travels from rarer to denser it bends ______ from the normal

• towards

• away