Fill in the blanks in the following-a- A person - 1-m in front of a plane mirror seems to be - m from his image-b- If you nbsp-touch your - ear with right hand in front of a plane mirror it will be nbsp-seen in the mirror that your right ear is touched with -c- The size of the nbsp-pupil becomes - when you see in dim light-d- Night birds have nbsp- cones than rods in their eyes-

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Byju's Answer

Standard VIII

Physics

Apparent Depth

Fill in the b...

Question

Fill in the blanks in the following:
(a) A person $1$ m in front of a plane mirror seems to be ______ m from his image.
(b) If you touch your _ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with .
(c) The size of the pupil becomes when you see in dim light.
(d) Night birds have ___ cones than rods in their eyes.

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Solution

(a) A person 1m in front of a plane mirror seems to be $2 m$ from his image.

Distance between mirror and object $d_{1} = 1 m$
Hence, distance between mirror and image $d_{2} = 1 m$
Image formed by the plane mirror is behind the mirror. Hence, distance between object and image, $d = d_{1} + d_{2}$
$d = 1 + 1 = 2 m$
(b)
If you touch your $left$ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with $left hand$ .
Image formed in the plane mirror is laterally inverted. Hence right ear appears as left ear in the image and the left hand appears as right hand in the image.
(c)
The size of the pupil becomes $large$ when you see in dim light.
The eye pupil adjusts itself to capture more light in the dark and increases its size.
(d)
Night birds have $less$ cones than rods in their eyes.
Rods are sensitive to dim light and cones are sensitive to bright light. Since the night birds can see in the night, they have more rods.

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Similar questions

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 _____ hand.

Q. Question 06.2
Fill in the blanks in the following.
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 _________.

Fill in the following blanks with suitable words:

(a) The angle of ................... equals the angle of reflection.

(b) A person 1 m in front of a plane mirror seems to be ................... m away from his image.

(c) If you touch your ................... ear with right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with ...................

(d) The size of pupil becomes ................... when you see in dim light.

(e) Night birds have ...................cones than rods in their eyes.

(f) The image of an object persists on the retina of an eye for about ................... second even after the object has disappeared.

(g) If the still pictures of a moving object are flashed on our eyes at a rate faster than ................... pictures per second,the eye perceives the object as moving.

(i) In a movie, the still pictures in proper sequence are projected on the screen usually at the rate of ................... pictures per second.

Q. If you touch your _ ear with right hand in front of a plane mirror it will be seen in the mirror that you are right ear is touch with _ hand

Q. While standing in front of a plane mirror, if you touch your ............ ear with the right hand, it will be seen in the mirror that your right ear is touched with your ................ hand.

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