Question

An object is placed at a distance of 4 cm infront of a convex mirror whose focal length is 5 cm. Where is the image formed?

Answer 1

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12th

Physics

Ray Optics and Optical Instruments

Image Formation by Spherical Mirror

An object is placed at a di...

PHYSICS

Asked on January 17, 2020 byNeenad Dsouza

An object is placed at a distance of 10 cm from a convex mirror of focal length 5 cm.

(i) Draw a ray-diagram showing the formation of image. 

(ii) State two characteristics of the image formed.

(iii) Calculate the distance of the image from mirror.



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ANSWER

Object Distance(u) = 10 cm. (negative)

Focal length of the lens (f) = 5 cm.

We know, convex mirror always forms the virtual, upright and diminished.Also, Object distance in the convex mirror is always negative where as Image distance and focal length are positive.

Now, Applying the Mirror's Formula,

f1 =v1 +u1

= 51 =v1 +1

=51 =10v(10−v)

10v=50−5v

15v=50

v=310

so the image distance (v) =3.33cm.

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