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Solutions of Reflection of Light (Page No- 178) - Physics By Lakhmir Singh, Class 10 | Extra Documents, Videos & Tests for Class 10 PDF Download

Lakhmir Singh Physics Class 10 Solutions Page No:178

Question 1: Name the spherical mirror which has :
virtual principal focus.
real principal focus.

Solution : (a) Convex mirror (b) Concave mirror

Question 2: Out of convex mirror and concave mirror, whose focus is situated behind the mirror ?

Solution : Convex mirror

Question 3: Find the focal length of a concave mirror whose radius of curvature is 32 cm.

Solution : Radius of curvature (R) = 32cm
Focal length (f) = ?
We know that
f = R/2
= 32/2
f = 16cm

Question 4: If the focal length of a convex mirror is 25 cm, what is its radius of curvature ?

Solution : Focal length (f) = 25 cm
Radius of curvature (R) = ?
We know that
f = R/2
25=R/2
R= 25 x 2
R = 50 cm.

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FAQs on Solutions of Reflection of Light (Page No- 178) - Physics By Lakhmir Singh, Class 10 - Extra Documents, Videos & Tests for Class 10

1. What is reflection of light?
Ans. Reflection of light is the phenomenon where light waves bounce off a surface and return to the same medium from where they originated. It is the reason we are able to see objects around us, as the reflected light enters our eyes.
2. How does reflection of light occur?
Ans. Reflection of light occurs when a light wave strikes a smooth surface and bounces back. The angle of incidence, which is the angle between the incident ray and the normal to the surface, is equal to the angle of reflection, which is the angle between the reflected ray and the normal to the surface.
3. What are the laws of reflection?
Ans. The laws of reflection state that the incident ray, the reflected ray, and the normal to the surface at the point of incidence all lie in the same plane. Also, the angle of incidence is equal to the angle of reflection.
4. What are some examples of reflection of light in daily life?
Ans. Some examples of reflection of light in daily life include the reflection of light in a mirror, the reflection of light in still water, the reflection of light from a polished surface, and the reflection of light from a shiny metal object.
5. How is reflection of light used in practical applications?
Ans. The reflection of light is used in various practical applications. Mirrors are used for reflection in optical devices like telescopes, microscopes, and cameras. Reflectors are used in headlights of vehicles to increase visibility. Reflective surfaces are used in solar panels to capture and utilize sunlight.
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