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Luminous Intensity

Q. What part ...

Question

Q. What part of second is called nanosecond?
Q. _____ is the phenomenon by which incident ray of light is sent back to same medium after falling on a smooth surface.
Q. Read the statements and choose the correct option.
1. Moon is a luminous sources of light.
2. A glow worm is a natural source of light.

A. only i is true
B. only ii is true
C. Both are true
Both are false

Q. _image is formed by a pinhole camera.

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Solution

Dear Student,

$1 n a n o s e c o n d = \frac{1}{10^{9}} s e c o n d = 10^{- 9} s e c o n d . 2 - A l u m i n o u s o b j e c t i s o n e t h a t g i v e s o f f l i g h t . I n o t h e r w o r d s, i t g l o w s (o r s h i n e s) o f i t s o w n a c c o r d . T o b e a b l e t o g l o w, t h e o b j e c t m u s t h a v e i t s o w n s o u r c e o f e n e r g y . H e n c e m o o n i s n o t a l u m i o u s o b j e c t b e c a u s e i t a p p e a r b r i g h t d u e l i g h t o f s u n . A g l o w w o r m i s a n a t u r a l s o u r c e o f l i g h t . O p t i o n B i s c o o r e c t . 3 - A P i n h o l e C a m e r a i s a s i m p l e c a m e r a w i t h o u t a l e n s b u t w i t h a t i n y a p e r t u r e, a p i n h o l e - e f f e c t i v e l y a l i g h t - p r o o f b o x w i t h a s m a l l h o l e i n o n e s i d e . L i g h t f r o m a s c e n e p a s s e s t h r o u g h t h e a p e r t u r e a n d p r o j e c t s a n i n v e r t e d i m a g e o n t h e o p p o s i t e s i d e o f t h e b o x$

Regards.

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Similar questions

Q. Match the beginnings and endings of the sentences:

Beginnings	Endings
1. A pinhole camera is	(a) travelling of light in a straight line.
2. Moon and Venus are	(b) natural source of light.
3. Rectilinear propagation of light is	(c) give out light of their own.
4. Luminous objects	(d) based upon the principle of rectilinear propagation of light.
5. Glow-worm is a	(e) illuminating objects.

The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ___.

Q. The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ........

Q. Fill in the blanks:-
1. The ………… is a natural source of light.
2. A ………… is an artificial source of light.
3. While passing through a prism, light splits into ………… colors.
4. The image obtained in a pinhole camera is …………

Q. Fill in the blanks using the correct word given in the bracket:
1. Light is a form of ............................ . (energy/electricity)
2. All bodies which emit light energy by themselves are called ............................ bodies. (luminous/opaque)
3. Light travels in a ............................ line. (straight/curved)
4. A glowing electric bulb is an example of ............................ source of light. (natural/artificial)
5. Any polished surface from which regular reflection takes place is called a ............................ . (mirror/obstacle)
6. Reflection from a mirror gives clear ............................ . (image/shadow)
7. The shadow of a coloured object is ............................ . (coloured/black)
8. The image formed by a mirror is due to ............................ of light. (reflection/ propagation)

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