Geometrical OpticsEasy
Question
A short linear object of length b liesalong the axis of a concave mirror of focal length f at a distance u from the pole of the mirror. The size of the image is approximately equal to
Options
A.
B.
C.
D.
Solution
From the mirror formula
[f = constant] ...... (i)
- v-2 dv - u-2du = 0
or |dv| =
|du| ...... (ii)
Here, |dv| = size of image
|du| = size of object (short) lying along the axis = b
Further, from Eq. (i) we can find
Substituting these values in Eq. (ii), we get
Size of image
∴ Correct option is (d).
[f = constant] ...... (i)- v-2 dv - u-2du = 0
or |dv| =
|du| ...... (ii)Here, |dv| = size of image
|du| = size of object (short) lying along the axis = b
Further, from Eq. (i) we can find
Substituting these values in Eq. (ii), we get
Size of image
∴ Correct option is (d).
Create a free account to view solution
View Solution FreeMore Geometrical Optics Questions
A thin prism P1 with angle 6o and made from glass of refractive index 1.54 is combined with another thin prism P2 of ref...When a ray of light enters a glass slab, then...A cubical block of glass of refractive index n1 is in contact with the surface of water refractive index n2. A beam of l...A concave mirror gives an image three times as large as the object placed at a distance of 20 cm from it. For the image ...The speed of light in media M1 and M2 are 1.5 × 108 m/s and 2.0 × 108 m/s respectively. A ray of light entres ...