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CBSE Class 10 Physics Light Reflection and Refraction

Improve your Science skills with our Most Important Questions Doubts and Solutions CBSE Class 10 Physics Chapter Light, Reflection and Refraction. Grasp the concepts of spectrum of light, convex lens, concave lens, and more. Strengthen your Science basics to become more confident in attempting complex Physics numericals in your board exam.

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Reflection of Light

The process of sending back the light rays which falls on the surface of an object is known as reflection of light.
Laws of reflection 1: The incident ray, the reflected ray and the normal at the point of incidence, all lie in the same plane.
Laws of reflection 2: The angle of incidence is equal to the angle of reflection.
Lateral Inversion is the interchange of left and right side of an object as viewed in a plane mirror.

Spherical Mirrors

A spherical mirror whose reflecting surface is curved outwards and polished on the inner spherical surface is convex mirror.
A spherical mirror whose reflecting surface is curved inwards and polished on the outer spherical surface is concave mirror.
The point on the principal axis where rays are incident parallel to the principal axis converge to or appear to diverge from after reflection is known as the principal focus of the spherical mirror.

Reflection by Spherical Mirrors

As the object moves towards the pole of concave mirror, the image moves away from the pole except when the object is placed between focus and pole of the mirror.
As the object moves towards the pole of concave mirror, the size of image increases and it's highly enlarged when object is at focus.
As the object moves towards the pole of the convex mirror, the size of image increases but its nature is always virtual and erect.

Mirror Formulae

Define New Cartesian Sign convention, object/image distance, mirror formula and magnification produced by spherical mirrors

Refraction of Light

The phenomenon of bending of light from its straight-line path at the interface of two media is called refraction.
Laws of refraction: The incident ray, the refracted ray and the normal are co-planar.
Laws of Refraction 2: The ratio of the sine of angle of incidence to the sine of angle of refraction is a constant for a given pair of medium and for a given wavelength of light.

Refraction Through Glass

The ratio of speed of light in vacuum to the speed of light in a medium is called the refractive index of the medium.
The shifting of emergent ray sideways from the direction of original incident ray in a glass slab is called lateral displacement.
The angle through which a ray of light turns on passing through a prism is called the angle of deviation.

Refraction Through Spherical Lens

As the object moves towards the optical centre of convex lens, the image moves away from the optical centre except when the object is placed between focus and optical centre of the lens.
As the object moves towards the optical centre of the convex lens, the size of image increases and it's highly enlarged when object is at focus.

Lens Formulae

Define New Cartesian Sign convention, object/image distance, lens formula, magnification, power and combined focal length of thin spherical lenses.

Spherical Lens and its Power

A lens that is thicker at the middle than at the edges is called a convex lens, while a lens that is thicker at the edges is called a concave lens.
Convex lens converges the rays of light after refraction while concave lens diverges.
Spherical lens has two focuses: first and second principle focus.
Convex lens has real and concave lens has virtual focus.

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There are several benefits of becoming proficient in the basics of Physics. Most topics in Physics are based on logic. If you know how to apply logic to application-based Physics questions, you will find the right answer quickly. However, if your basics are not clear, you will waste a lot of time while solving problems. Also, with the basics not clear, you may or may not know if your answer is correct.

Physics is an interesting subject that opens your mind to several scientific facts such as reflection of light. Build your cognitive thinking abilities by asking doubts. Ask our experts questions on principal focus of a concave mirror or clear your doubts on whether light really travels fast. Understand what a refractive index is and find out about the materials you can use to make a lens.

Through TopperLearning’s CBSE Class 10 Physics Light, Reflection and Refractions Doubts and Solutions, learn to calculate the power of a lens. You’ll also find expert answers wherein you get a step-wise explanation on the correct usage of the lens formula to solve Physics problems. Another critical concept from this chapter that can be difficult for some students is the ray diagram. Our experts have also got that topic covered in the doubts and solutions for Physics.

At TopperLearning, all it takes for a doubt to get resolved is asking questions on the ‘Ask The Expert’ platform.

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