Write true or false for each statement :

(a) The moon is a natural source of light.

(b) The moon is self luminous.

(c) We can see an object through an opaque medium.

(d) Light passes through glass.

(e) Light travels in a straight line path.

(f) Image formed in a pin hole camera is real.

(g) The image in a pin hole camera gets blurred if the hole is made bigger.

(h) A shadow is formed because light travels in a straight line path.

(i) Solar eclipse occurs when the sun comes in between the earth and the moon.

(j) If the shadow of earth falls on the moon, the eclipse is called lunar eclipse.

(a) False because the moon is not a natural source of light.

(b) False since the moon does not emit light by it's own, but become visible (or shine) by the light falling on it from the sun.

(c) False as an opaque medium does not allow any light to pass through it so we cannot see the objects through an opaque medium.

(d) True because glass is a transparent medium as light can pass through it easily.

(e) True since light always travels in a straight line path so this motion of light in a straight line path is called the rectilinear propagation of light.

(f) True as characteristics of the image formed by the pin hole camera are :

1. It is real i.e., it is formed on the screen.
2. It is inverted or upside down.
3. It is generally smaller in size than the object (because the object is far away from the pin hole than the screen).

(g) True because a bigger hole is equivalent to a large number of pin holes where each pin hole produces one image and these images overlap each other resulting in a blurred image.

(h) True as the rays which fall on the object, are blocked and they do not reach the screen. Thus, a portion on the screen does not receive any light and remains dark. This dark portion on the screen is called the shadow of the object.

(i) False because solar eclipse occurs on a certain new moon's day, when the moon comes in between the sun and the earth, the moon casts its shadow on the earth

(j) True since lunar eclipse occurs on a certain full moon night, when the earth comes in between the sun and the moon, the earth casts its shadow on the moon. The part of the moon which lies within the umbra of earth, will not be visible from the earth. Thus, the lunar eclipse takes place.