Geometrical OpticsHard

Question

An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be:-

Options

A.

30 cm away from the mirror

B.

36 cm away from the mirror

C.

30 cm towards the mirror

D.

36 cm towards the mirror

Solution


v1=ufu-f=(-40)(-15)-40+15=600-25=-24cm

v2=ufu-f=(-20)(-15)-20+15=-60cm
Displacement of image = v2 – v1 = –36 cm
= 36 cm away from the mirro

Create a free account to view solution

View Solution Free
Topic: Geometrical Optics·Practice all Geometrical Optics questions

More Geometrical Optics Questions

An astronomical telescope has an angular magnification of magnitude 5 for far bjects. The separation between the objecti...A concave mirror of focal length f (in air) is immersed in water (μ = 4/3). The focal length of the mirror in water...A short sighted person can see distinctly only those objects which lie between 10 cm and 100 cm from him. The power of t...A converging beam of rays is incident on a diverging lens. Having passed through the lens the ray intersect at a point 1...A thin prism having refracting angle 10o is made of glass of refractive index 1.42. This prism is combined with another ...