Science MCQ

In a periscope, the mirrors are ………….. .

In a kaleidoscope, the mirrors are inclined to each other at ……. .

If the angle of incidence is 20°, the angle made by the reflected ray with the normal to the surface must be ……… .

If the angle of incidence is 40°, the angle made by the reflected ray with the surface of the plane mirror must be ……. .

If the angle made by the incident ray with the surface of a plane mirror is 30°, the angle of reflection must be …….. .