A Problem from Optics – Reflection of light

Convex and concave mirrors have same radii of curvature R. The distance between the mirrors is 2R. At what point on the common optical axis of the mirrors should a point source of light A be placed for the rays to converge at the point A after being reflected first on the convex and then … Continue reading A Problem from Optics – Reflection of light

Mirror Mirror Relativity

Can you see your image when you are travelling at the speed of light? Visitors and students are requested to respond and answer via comments. Einstein’s Theory of relativity says:”The Laws of Physics are the same in any Inertial Frame of Reference.”

Numerical Problems From Optics

When an object of height 4cm is placed at 40cm from a mirror the mirror forms the image on the object itself. If the height of the image is equal to the height of the object. Find out the focal length of the mirror and identify the mirror. A convergent beam of light passes through … Continue reading Numerical Problems From Optics

Spherical Mirror Problem

A rear view mirror used in a bus has a radius of curvature 3.5 m. If the driver of the bus locates a car at 10.0m behind the bus, find the position, nature and size of the image of the car. Ans: f = r/2=-1.75 m u=-10m v=?

Numerical problem from image formation by spherical mirror – optics

An object is placed 18cm in front of a spherical mirror. if the image formed is 4cm to the right of the mirror calculate the focal length and radius of curvature? what is the nature of the mirror? (The question was posted by Anisha)

Numerical Problems from Light

Madhu sent us the following problems from "Light". Visitors can attempt to solve the problems by quoting the question number. Most of the questions below are based on mirror formula and lens formula.   Mirror Formula   Lens Formula   Now try solving these questions/problems. If in doubt or not able to solve the problems, … Continue reading Numerical Problems from Light


LIGHT –REFLECTION AND REFRACTION QUESTIONS TO PRACTICE 1. What are the differences between real image and virtual image? 2. The radius of curvature of a concave mirror is -46cm.What is its focal length? 3. How will you identify a plane mirror, a concave mirror and a convex mirror without touching their surface? 4. Which mirror … Continue reading LIGHT –REFLECTION AND REFRACTION QUESTIONS TO PRACTICE