Size of image of an object by a mirror

Asked by admin @ 13/08/2021 in Physics viewed by 340 People

Size of image of an object by a mirror having focal length of 20cm is observed to be reduced to 1/3rd of its size. At what distance tthe object has been placed from the mirror? What is the nature and size?

Answered by admin @ 13/08/2021

HII!

lets see the answer in cases!1

CASE 1:- m=-1/3(in case of concave mirror)

f= -20 cm
m= -1/3 =-v/u
v=u/3

1/f= 1/v +1/u .

=> -1/20 = 3/u + 1/ u= 4/u

therefore.,, u = -80 cm.

CASE 2:-

M=+1/3 (IN CASE OF CONVEX MIRROR)

f=+20 cm.

m=+1/3 =-v/u

v=-u/3.

i/f=1/v+1/u.
=> 1/20= -3/4 + 1/4 =-2/4

therefore, u= -40 cm.

hope it helps!!

please mark as brainliest

thank you!!

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Asked by maham237 @ 13/01/2021 in Physics viewed by 1200 persons

Mind map for light reflection and refraction class 10

Asked by admin @ 23/08/2021 in Physics viewed by 1144 persons

A thief runs at a speed of 10m s

Asked by admin @ 23/08/2021 in Physics viewed by 1095 persons

The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.

Asked by maham237 @ 10/01/2021 in Physics viewed by 1095 persons

A 5.8 x 10 4 watt elevator motor can lift

Asked by maham237 @ 20/06/2021 in Physics viewed by 1080 persons

Size of image of an object by a mirror

Similar Questions

Distance of the object and image from the mirror answer

A convex mirror is placed to the right of an object. the image formed by the mirror will be a

Why can convex mirrors form only one type of image

To get three images of a single object

Image formed by a plane mirror is always

A concave mirror always form a real image

A concave mirror gives an image three times

An object placed in front of a convex mirror

A student obtained a blurred image of an object

Does a concave mirror always form a real image

An image formed by a plane mirror is always

If the image formed by mirror for all positions

Image distance of convex mirror is positive or negative

How can we see our image in the mirror

What type of image is formed by plane mirror

Most viewed questions in Physics

Jeevandeep health and physical education std 10 answers pdf

Hc verma physics class 9 solutions of describing motion

How to leave nightmare land answer key

Base area and stability of some objects with different shapes

Which of the following statements about safe lifting are correct

Porous water-absorbing mass of fibers

Absorption of water by filter paper is due to

A composite wire of uniform diameter 3mm

At a distance l 400m from the traffic light

A rocket of mass m is launched straight up with thrust f⃗ thrust.

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Mind map for light reflection and refraction class 10

A thief runs at a speed of 10m s

The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.

A 5.8 x 10 4 watt elevator motor can lift