NEET UG Ray Optics and Optical Instruments — practice questions
40 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Ray Optics and Optical Instruments in the app →The relation between focal length f and radius of curvature R for a spherical mirror is:In the Cartesian sign convention used in ray optics:The mirror equation (relating object distance u, image distance v, focal length f) is:The linear magnification produced by a spherical mirror is given by:
An An object placed at 5 cm in front of a concave mirror (R = 15 cm; f = −7.5 cm) forms an image that is:A real image formed by a mirror is one that:A convex (diverging) mirror always forms an image that is:If n₂₁ is the refractive index of medium 2 w.r.t. medium 1, then n₁₂ equals:When light passes through a rectangular glass slab, the emergent ray is:A coin lies at the bottom of a tank of water (refractive index n_w). To an observer looking from directly abovTotal internal reflection (TIR) occurs when:For light going from a medium of refractive index n to air, the critical angle i_c is given by:The critical angle for diamond (n ≈ 2.42) and water (n ≈ 1.33) is approximately:Optical fibres transmit signals using:For refraction at a single spherical surface from medium 1 (n₁) to medium 2 (n₂), the relation between object The lens-maker's formula for a thin lens (refractive index n) with radii of curvature R₁ and R₂ is:The magnification produced by a thin lens is:The power P of a lens with focal length f (in metres) is:A convex lens of focal length 20 cm forms a real, inverted image of an object placed at 30 cm in front of it. For a prism, the angle of deviation D is related to the angle of prism A and refractive index n by (at minimumDispersion of white light by a prism occurs because:Which colour of light deviates LEAST when white light passes through a glass prism?The speed of light in vacuum is approximately:'Optical density' of a medium is:For a concave lens (diverging lens), the image of a real object is always:Snell's law of refraction at the boundary between two media of refractive indices $n_1$ and $n_2$ statesThe CRITICAL ANGLE for total internal reflection at the boundary between a denser medium (refractive index $n$The relationship between the focal length $f$ and the radius of curvature $R$ for a SPHERICAL MIRROR isUsing the standard sign convention (light travels left to right, distances measured from pole, +ve to right), An object is placed at $30\,\text{cm}$ in front of a concave mirror of focal length $20\,\text{cm}$. The imageThe LENSMAKER'S formula for a thin lens of refractive index $n$ (in air) with radii of curvature $R_1$ and $R_The POWER of a lens (in diopters, D) is defined asTwo thin lenses of powers $+5\,\text{D}$ and $-3\,\text{D}$ are placed in CONTACT. The total power of the combOptical fibres use TOTAL INTERNAL REFLECTION to transmit light over long distances. The MAIN condition for theA converging lens of focal length $20\,\text{cm}$ produces a real image at $30\,\text{cm}$ from the lens. The Light passing through a PRISM is dispersed because different colours of light haveWhen light travels from one medium to another, which property of the wave REMAINS UNCHANGED?An object is placed at the FOCUS of a concave mirror ($u = f$, both negative). The image forms atThe phenomenon by which the apparent position of a star near the horizon appears slightly higher than its actu