Free PDF Download of CBSE Class 12 Physics Chapter 9 Ray Optics and Optical Instruments Assertion Reason Questions for Class 12 Physics. Class 12 Physics Assertion Reason Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 12 Physics Ray Optics and Optical Instruments to know their preparation level.
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Ray Optics and Optical Instruments Class 12 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) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.
Assertion (A) : Higher is the refractive index of a medium or denser the medium, lesser is the velocity of light in that medium.
Reason (R) : Refractive index is inversely proportional to velocity.
(a) Both A and R are true and R is the correct explanation of A
Assertion (A) : Endoscopy involves use of optical fibres to study internal organs.
Reason (R) : Optical fibres are based on phenomena of total internal reflection.
(d) A is false and R is also false.
Assertion (A) : If optical density of a substance is more than that of water, then the mass density of substance can be less than water.
Reason (R) : Optical density and mass density are not related.
(a) Both A and R are true and R is the correct explanation of A
Assertion (A) : Microscope magnifies the image.
Reason (R) : Angular magnification for image is more than object in microscope.
(a) Both A and R are true and R is the correct explanation of A
Assertion : Plane mirror may form real image.
Reason : Plane mirror forms virtual image, if object is real.
(b) Both A and R are true but R is not the correct explanation of A.
Assertion : The optical instruments are used to increase the size of the image of the object.
Reason : The optical instruments are used to increase the visual angle.
(d) A is false and R is also false.
Assertion : The resolving power of a telescope is more if the diameter of the objective lens is more.
Reason : Objective lens of large diameter collects more light.
(a) Both A and R are true and R is the correct explanation of A
Assertion : If the rays are diverging after emerging from a lens; the lens must be concave.
Reason : The convex lens can give diverging rays.
(d) A is false and R is also false.
Assertion: The focal length of an equiconvex lens of radius of curvature R made of material of refractive index μ = 1.5, is R.
Reason : The focal length of the lens will be R/2.
(c) A is true but R is false.
Assertion (A): When light passes from a rarer medium to a denser medium, it bends towards the normal.
Reason (R): Refraction occurs due to the change in speed of light as it passes from one medium to another.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The focal length of a concave lens is positive.
Reason (R): A concave lens diverges light rays and forms a virtual 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): A convex lens can form both real and virtual images.
Reason (R): A convex lens can form a real image when the object is placed beyond the focal point and a virtual image when the object is placed between the lens and the focal point.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The magnification produced by a plane mirror is always one.
Reason (R): A plane mirror forms a virtual image that is the same size as the object and at the same distance behind the mirror as the object is in front.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The power of a lens is directly 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 increases, the power decreases.
Answer: (c) A is true but R is false.
Assertion (A): A convex lens always forms a real and inverted image for an object placed beyond the focal point.
Reason (R): Beyond the focal point, the light rays converge to form a real image that is inverted.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The critical angle is the minimum angle of incidence at which total internal reflection occurs.
Reason (R): Total internal reflection occurs when light travels from a denser medium to a rarer medium at an angle greater than the critical angle.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A convex lens can form a magnified virtual image for an object placed between the lens and its focal point.
Reason (R): For an object placed between the lens and the focal point, the lens forms a virtual image that is magnified and upright.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A concave lens always forms a virtual and erect image for any object.
Reason (R): The diverging nature of a concave lens causes it to form a virtual and erect image for all object positions.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A real image formed by a convex lens is always inverted.
Reason (R): A real image is formed when light rays actually converge at a point, and this convergence results in an inverted image.
Answer: (a) Both A and R are true and R is the correct explanation of A.
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