Free PDF Download of CBSE Class 10 Science Chapter 10 Light Reflection and Refractions Assertion Reason Questions Class 10 Science. Assertion and Reason Questions for Class 10 Science with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 10 Science Light Reflection and Refractions to know their preparation level.
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Light Reflection and Refractions Class 10 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct
Assertion: A point object is placed at a distance of 26 cm from a convex mirror of a focal length of 26 cm. The image will not form at infinity.
Reason: For the above-given system the equation 1/u+1/v= 1/f gives v = ∞.
(c) If Assertion is correct but Reason is incorrect.
Assertion: Keeping a point object fixed, if a plane mirror is moved, the image will also move.
Reason: In the case of a plane mirror, the distance between the object and Its image is equal from any point on the mirror.
(d) If Assertion is incorrect but Reason is correct
Assertion: If both plane mirror and object are moved through a distance x, then the image moves through a distance 2x.
Reason: When the object is fixed and the plane mirror is moved through a distance x. Then the image also moves through the distance 2x.
(c) If Assertion is correct but Reason is incorrect.
Assertion: If a spherical mirror is dipped in water, its focal length remains unchanged.
Reason: A laser light is focused by a converging lens. There will be a significant chromatic aberration.
(c) If Assertion is correct but Reason is incorrect.
Assertion: Large concave mirrors are used to concentrate sunlight to produce heat in solar cookers.
Reason: Concave mirror converges the light rays falling on it to a point.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Assertion: A plane mirror may form a real image.
Reason: Plane mirror forms virtual image if objects are real.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
Assertion: Refractive index has no units.
Reason: The refractive index is a ratio of two similar quantities.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Assertion: When a concave mirror is held underwater, its focal length will increase.
Reason: The focal length of a concave mirror is independent of the medium in which it is placed.
(d) If Assertion is incorrect but Reason is correct
Assertion: A convex mirror is used as a driver’s mirror.
Reason: Because the convex mirror’s field of view is large and images formed are virtual, erect, and diminished.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Assertion: A virtual image cannot be photographed.
Reason: Only real objects are photographed.
(c) If Assertion is correct but Reason is incorrect.
Assertion: Propagation of light through an optical fibre is due to total internal reflection taking place at the core-clade interface.
Reason: Refractive index of the material of the core
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
Assertion (A): Light travels in a straight line.
Reason (R): Light is a form of energy that travels in the form of electromagnetic waves.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): When light rays strike a polished surface, regular reflection occurs.
Reason (R): Regular reflection happens when parallel light rays reflect off a smooth surface in a single direction.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The angle of incidence is equal to the angle of reflection.
Reason (R): According to the law of reflection, the angle at which light strikes a surface is equal to the angle at which it reflects.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The image formed by a plane mirror is virtual and laterally inverted.
Reason (R): In a plane mirror, the image formed is a reflection of the object and appears behind the mirror, laterally inverted.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): When light passes from a rarer medium to a denser medium, it bends towards the normal.
Reason (R): Refraction occurs when light waves change direction as they pass from one medium to another due to a change in their speed.
Answer: (c) A is true but R is false.
Assertion (A): The refractive index of a medium determines the extent of bending of light.
Reason (R): The refractive index is a measure of how much a medium can slow down the speed of light and is directly related to the angle of refraction.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The phenomenon of dispersion occurs when white light passes through a prism and splits into its component colors.
Reason (R): Different colors of light have different wavelengths and refract at different angles, causing them to separate.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The focal length of a convex lens is positive.
Reason (R): A convex lens converges light rays and forms a real image, which requires a positive focal length.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The power of a lens is inversely proportional to its focal length.
Reason (R): The power of a lens is defined as the reciprocal of its focal length, and as the focal length decreases, the power increases.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Total internal reflection occurs when light travels from a denser medium to a rarer medium at an angle greater than the critical angle.
Reason (R): When the angle of incidence exceeds the critical angle, all the light is reflected back into the denser medium.
Answer: (a) Both A and R are true and R is the correct explanation of A.
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