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Download all answers in PDF file format or download Offline apps to use all the contents offline without internet. So, 10th Science chapter 10 question answers are useful for UP Board students. 10th ncert physics pdf keyword of images formed by a plane mirrors: i The image formed by a plane mirror is virtual and erect. Properties of the image formed by a convex mirror: i This image is always virtual and erect.
Laws of refraction of light: The refraction of light obeys the following two laws: First law: The incident ray, the refracted ray and normal to the surface of separation at the point of incidence, all lie in the same plane. Second law: The ratio of the sine of the angle of incidence and the sine of the angle of refraction is constant for a given pair of media. The ratio n2 is called refractive index of the second medium 10th ncert physics pdf keyword respect to the first medium.
Refraction of light: The phenomenon of bending of light from its straight line path as it passes obliquely from one transparent medium to another is called 10th ncert physics pdf keyword of light. The path of the ray of light in the first medium is called incident ray. The path of the ray of light in the second medium is called refracted ray.
The angle between the incident ray and the normal at the surface of separation is called angle of incidence i. The angle between the refracted ray and the normal at the surface of separation is called angle of refraction r. Question 1: Give three points of difference between real and virtual images. Answer 1: Real Image: i Here the rays actually meet at the image point. Question 2: Distinguish between a concave and convex lens.
Answer 2: Convex lens a It is thicker at the centre than at the edges. Concave lens: a It is thinner at the centre than at the edges. Question 1: Define the principal focus of a concave mirror. Calculate the focal length of the mirror of radius of curvature of 20 cm.
Answer 1: The principal focus of concave mirror is a point on its principal axis at which a beam of light parallel to the principal axis actually converges after reflection from the mirror. Question 2: State the type of mirror preferred as i rear view mirror in vehicles, ii shaving mirror. 10th ncert physics pdf keyword your answer giving two reason in each case.
Answer 2: i A convex mirror is preferred as a rear-view mirror because a It always forms an erect, virtual and diminished image of an object placed anywhere in front of it. This suggests that the speed of light in diamond will reduce by a factor 2. The S. It is denoted by D. Important questions and CBSE previous years board questions related to chapter 10 are given with answers.
List four properties of the image formed by a plane mirror. List the four properties of the image formed by a convex mirror. State the laws of refraction of light. What is meant by refraction of light? Important Questions on 10th Science Chapter 10 Define the principal focus of a concave mirror.
Light rays that are parallel to the principal 10th ncert physics pdf keyword of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror.
This point is known as the principal focus of the concave mirror. The radius of curvature of a spherical mirror is 20 cm. What is its focal length? Name the mirror that can give an erect and enlarged image of 10th ncert physics pdf keyword object. When an object is placed between the pole and the principal focus of a concave mirror, the image formed is virtual, erect, and enlarged.
Why do we prefer a convex mirror as a 10th Class Physics Notes Pdf Ncert Al rear-view mirror in vehicles? Convex mirrors give a virtual, erect, and diminished image of the objects Ncert Physics Class 10th Pdf Into placed in front of.
They are preferred as a rear-view mirror in vehicles because they give a wider field of view, which allows the driver to see most of the traffic behind. A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal?
The light ray bends towards the normal. When a ray of light travels from an optically rarer medium to an optically denser medium, it gets bent towards the normal. Since water is optically denser than 10th ncert physics pdf keyword, a ray of light travelling from air into the water will bend towards the normal.
The refractive index of diamond is 2. What is the meaning of this statement? Define 1 dioptre of power of a lens. Power of lens is defined as the reciprocal of its focal length.
Chapter Human Eye and Colourful World �.
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