Physics
Fill in the blanks:
(a) Water is optically …………… than air.
(b) Air is optically …………… than glass.
(c) When a ray of light travels from water to air, it bends …………… the normal.
(d) When a ray of light travels from air to glass, it bends …………… the normal.
(e) When white light passes through a prism, it …………… .
(f) The splitting of white light into its constituent colours is called …………… .
(g) A …………… mirror is obtained on silvering the outer surface of a part of a hollow glass sphere.
(h) Radius of curvature of a spherical mirror is …………… its focal length.
(i) The angle of incidence for a ray of light passing through the centre of curvature of a spherical mirror is …………… .
(j) A …………… mirror always forms a virtual image.
(k) A concave mirror forms a virtual image for an object placed …………… .
Related Questions
Explain the following:
The sun is seen before the sunrise and after the sunset.
What is a mirage? Give a reason for its formation.
You are given a disc divided into seven sectors with colours violet, indigo, blue, green, yellow, orange and red in them. What would be its color when it is rotated rapidly?
State the kind of mirror used:
(a) by a dentist, and
(b) as a street light reflector.