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.

Monjur Alahi

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. 


0 like 0 dislike
1 views
Share with your friends

1 Answers

Salim Ahmed Kawsar

Call

(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.

0 like 0 dislike
1 views
Talk Doctor Online in Bissoy App
A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror.

(b) – 20 cm is the correct option.

1 Answers 1 views
A child is standing in front of a magic mirror. She finds the image, the middle portion of her body of the same size and that of the legs smaller.

(c) Concave, plane and convex

1 Answers 1 views
Image formed by a plane mirror is (a) virtual, behind the mirror and enlarged. (b) virtual, behind the mirror

(b) virtual, behind the mirror and of the same size as the object.

1 Answers 1 views
A concave mirror produces three times (enlarged) magnified real image of an object placed at 10 cm in front of it. Where is the image located?

Here, in case of concave mirror u=10 cm [u, is always negative] v =?;m = - 3 [real image] Now the magnification formula is m= -v/u or -3= -(v/-10) or , v = -30 cm. Image will...

1 Answers 2 views
A man standing in front of a spherical mirror, finds his image having a very small head, a fat body and legs of normal size.

A very small head: Convex mirror, A fat body: Concave mirror, and Legs of normal size:Plane mirror.

1 Answers 3 views
How can you distinguish between a plane mirror, a concave mirror and a convex mirror without touching them?

By observing the virtual images formed by the three mirrors, we can distinguish between the mirrors as: (i) Plane mirror will produce an image of the same size, (ii) Concave mirror will...

1 Answers 2 views
In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?

No, to see the reflection, source of light is required. We can see only in the presence of light.

1 Answers 1 views
David is observing his image in a plane mirror. The distance between the mirror and his image is 4 m.

(iii) 6 m Explanation: As David moves 1 m towards the mirror, the image also moves 1 m towards the mirror. Now the distance between David and mirror is 3 m and...

1 Answers 1 views
The rear view mirror of a car is a plane mirror. A driver is reversing his car at a speed of 2 m/s.

(ii) 2 m/s Explanation: As the car moves 2 m backward, the mirror also moves 2 m backward, so image comes 2 m forward.

1 Answers 2 views
There are 6 tasks and 6 persons. Task 1 cannot be assigned either to person 1 or to person 2; task 2 must be assigned to either person 3 or person 4

(a) Task 1 can not be assigned to either person 1 or 2 i.e. there are 4 options. Task 2 can be assigned to 3 or 4 So, there are only 2 options...

1 Answers 1 views
X