# 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

# A problem from Optics

A convergent beam of light passes through a diverging lens of focal length 0.2m and comes to focus at distance 0.3m behind the lens.Find the position of the point at which the beam would converge in the absence of lens?

# CBSE 12th Std Physics Numerical from Optics

A convex lens of crown glass(1.5) has a focal length of 15 cm. The lens is placed in (a) water(1.33) and carbon bisulphide(1,65).determine in each case whether the lens behaves as a conveging or a diverging lens and determine its focal length. (Asked by Shobha) Answer: Formula used For the lens to be converging, f … Continue reading CBSE 12th Std Physics Numerical from Optics

# Why Rainbow is in the form of an arc?

Why is a rainbow always bent in the shape of a semi circle…?? but according to the theory light travels straight….!!! (Ramesh asked)

# A short introduction to Optics and the Nature of Light

INTRODUCTION LIGHT is a form of energy which causes the sensation of vision. Optics is the branch of Physics which studies the nature of light and the various phenomena associated with it. Nature of Light The nature of light was not at all thought until Newton attempted on it. Newton’s Corpuscular Theory According to Sir … Continue reading A short introduction to Optics and the Nature of Light

# Introduction to Light – NASA

Light is a form of radiant energy or energy that travels in waves. Since Greek times, scientists have  debated the nature of light. Physicists now recognize that light sometimes behaves like waves and, at other times, like particles. When moving from place to place, light acts like a system of waves. In empty space, light … Continue reading Introduction to Light – NASA

# Question from Wave Optics

Rajat Asked: What is the difference between interference and diffraction? Ans: Interference is caused by the superposition of wave fronts from two coherent sources; But diffraction is caused by the superposition of wavelets from a single wavefront when it confronts an obstacle or a slit. Note: Visitors are requested to add to the answer through … Continue reading Question from Wave Optics