Boards 2021 | किरण प्रकाशिकी एवं प्रकाश | RAY OPTICS AND LIGHT L-1 | Class 12 | Vipin Sir

Light (प्रकाश)|Ray Optics (किरण प्रकाशिकी )|Laws Of Reflections (परावर्तन के नियम)|OMR

Class 12 Maths | Chapter 1 | संबंध एवं फलन | Important Questions | Quick Revision

Class 12 Physics (Hindi)| Chapter 3 धारा विद्युत् Part 1| Important Questions | UP Boards

JEE Mains & Advanced | Chemistry - Ideal Gases By Vipin Sir | L1 English Medium

In figure, the optical fiber is l = 2 m long and has a diameter of d = 20 mum. If a ray of light is incident on one end of the fiber at angle theta_1=40^@ , the number of reflections it makes before emerging form the other end is close to : (refractive index of fiber is 1.31 and sin40^@=0.64 )

How To Revise Inorganic Chemistry in 1 Day ? Revise Inorganic Chemistry Fast For Class 12 Boards ?

Class 12 Chemistry | Chapter 5 | Surface Chemistry | Important Questions | CBSE Boards Revision | Part 1

Class 12 Chemistry | Chapter 10 | Haloalkanes and Haloarenes | Important Questions | CBSE Boards Revision | Part 1

A ray of light passsing through a point (1,2) is reflected on the x-axis at point Q and passes through the point (5,8). Then the abscissa of the point Q is