This page covers CDS Ray Optics & Optical Instruments with complete concept notes, 18 graded practice MCQs, key points and exam-specific tips. Free to study.
18graded MCQs · easy to hard · full solution & trap analysis
A convex lens has a focal length of 20 cm. An object is placed at a distance of 60 cm from the lens. What is the nature and position of the image formed?
A concave mirror has a radius of curvature of 40 cm. An object is placed at the center of curvature. What is the magnification of the image?
The power of a lens is –5 diopters. What is its focal length and type?
A convex lens of focal length 10 cm is used as a simple microscope. An object is placed at 5 cm from the lens. What is the nature of the image formed?
A concave lens has a focal length of 15 cm. An object is placed at 30 cm from the lens. What is the distance of the image from the lens?
A concave mirror has a focal length of 15 cm. An object is placed at a distance of 30 cm from the mirror. What is the magnification produced?
A convex lens has a power of +5 diopters. What is its focal length?
Light travels from a denser medium (refractive index 1.5) to a rarer medium (refractive index 1.0). The angle of incidence is 30°. What is the angle of refraction?
The critical angle for total internal reflection for a medium is 45°. What is the refractive index of that medium?
A thin lens produces a real, inverted image that is twice the size of the object. If the object distance is 20 cm, what is the focal length of the lens?
A convex mirror has a focal length of -10 cm. An object is placed 20 cm in front of it. What is the position of the image formed?
The least distance of distinct vision for a normal human eye is approximately:
A concave lens of focal length -20 cm is used as a simple magnifier. What is the maximum angular magnification when the final image is at the near point (25 cm)?
A plane mirror is moved 5 cm away from an object. How much does the distance between the object and its image increase?
A concave mirror of focal length 15 cm forms a real, inverted image of height 4 cm from an object of height 2 cm. If the object is placed at a distance of 30 cm from the mirror, what is the image distance?
A convex lens has a power of +5 diopters. An object is placed 40 cm in front of the lens. Calculate the position of the image formed.
A compound microscope has an objective lens of focal length 0.5 cm and an eyepiece of focal length 5 cm. If the tube length is 15 cm, what is the magnification produced?
A plano-convex lens has a radius of curvature of 20 cm for its curved surface. The lens is immersed in water (refractive index 1.33) with its plane surface facing the object. What is the focal length in water? (n_glass = 1.5)