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CBSE NCERT Solutions for Class 8 Science Chapter 16:
Mention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your Solution in each case.
(a) Polished wooden table
(b) Chalk powder
(c) Cardboard surface
(d) Marble floor with water spread over it
(f) Piece of paper
(a) Regular reflection
Fill in the blanks in the following.
(a) A person 1 m in front of a plane mirror seems to be m away from his image.
(b) If you touch your ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your .
(c) The size of the pupil becomes when you see in dim light.
(d) Night birds have cones than rods in their eyes.
(a) A person 1 m in front of a plane mirror seems to be 2 m away from his image.
(b) If you touch your left ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your left hand.
(c) The size of the pupil becomes large when you see in dim light.
(d) Night birds have less cones than rods in their eyes.
Explain how you can take care of your eyes.
We can take care of eyes by:
→ Visit an eye specialist regularly.
→ Avoid reading in dim light and very bright light.
→ Avoid direct exposure of sunlight to the eye.
→ Clean your eyes with cold water quickly if dust particles or small insects enter your eye. Do not rub your eyes.
→ Maintain a distance of at least 25 cm between the book and your eyes while reading.