Now light rays from sun rays after reflection from concave mirror will converge at focus. It is given that sunrays converge at 15 cm. So, focal length of the mirror = f = 15 cm.

Get CBSE Class 10 Science chapter 10, Light- Reflection and Refraction: ... Ray diagram showing the path of rays of light when it enters with oblique incidence from air into water ...

The film covers topics such as the speed of light, the principles of reflection and refraction, the functioning of lenses and prisms, and the nature of different types of light, including lasers.