Question

JAI HIND VIDYA MANDIR
771
4. State the mirror formula for determining the focal length of spherical mirrors write
the meanings of the symbols used an object is placed at a distance of 25cm. from a
concave mirror of foccal length 15cm. Calculate the distance of the image from the
mirror.
Ans (v= -37.5cm)
5. Find the position nature and size of the image formed by a convex lens of focal
length 12cm of an object 5cm high placed at a distance 20cm from it.
Ans(m=-1.5 nature = real and inverted, size of the image= -7.5 cm)
6.Light enters from air to glass having refractive index 1.5. What is the speed of light
in glass? The speed of light in vaccum is 3 x 10 m/s.
Ans (2 x 10 m/s.)
7. An object is placed at a distance of 10 cm from a convex mirror of focal length
length 15cm. Find the position and nature of image.
Ans (v= 30 and image is formed 6 cm behind the mirror as virtual and erect)
8. Find the focal length of a lense of power -2.0 D. What type of lense is this?​

Answer 1

Answer:

This equation predicts the formation and position of both real and virtual images in thin spherical lenses. It is valid only for paraxial rays, rays close to the optic axis, and does not apply to thick lenses. Also, it can be determined the curvature ratio of the lens.

(objectdistnce)

1

+

(imagedistance)

1

=

(focallength)

1

focal length= curvature/2

the equations are:

0

1

+

1

1

=

f

1

F=

2

r

where:−

O:− object distance

I:− formed image distance

f:− focal length

r:− curvature radius.

Explanation:

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