Question

a) A --------------------------- is a stream of light and is shown by a number of rays.
b) The image in a pinhole camera forms only due to ----------------------------------------
------- of light.
c) Light rays travelling towards the object are called -------------------------------
d) Light rays that bounce back after hitting an object are called ---------------------------------
e) ---------------------- is a distance between optical centre and the principal focus of a lens.
f) The change in the direction of light by a mirror is called ______________.
g) The image formed by a ____________ lens is always virtual, erect and smaller in size.
h) White light is composed of ______________ colours.
i) The image of an object formed by a _____________ cannot be obtained on a screen.
k) ___________​

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