NEET UG Optics — practice questions
29 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Optics in the app →A student says that if a real image formed by a convex lens can no longer be seen on a screen after the screenIn Fig. 9.27, the ray in air makes an angle of $60^\circ$ with the normal. The corresponding refracted angles A telescope has an objective lens of focal length $120\,\text{cm}$ and an eyepiece of focal length $5\,\text{cThe magnifying power of a telescope in normal adjustment is given byA compound microscope has objective focal length $f_o$ and eyepiece focal length $f_e$. If all other parameterThe approximate magnifying power of a compound microscope is given byWhy does a simple microscope provide magnification even though the angular size of the object equals the angulA student adjusts a simple microscope so that the final image is at infinity instead of at the least distance For a simple microscope, when the final image is formed at the least distance of distinct vision $D$, the magnA compound microscope has objective focal length $f_o=1.0\,\mathrm{cm}$, eyepiece focal length $f_e=2.0\,\mathFor a combination of thin lenses in contact, if the individual magnifications are $m_1, m_2, m_3, \dots$, thenTwo thin lenses of focal lengths $f_1$ and $f_2$ are in contact. What is the correct expression for the effectA lens has power $-4.0\,\mathrm{D}$. Which interpretation is correct?
$ into glass $(n_2=1.5)$ through a spherical surface of radius of curvature $R=Which set of conditions is necessary for total internal reflection to occur at an interface?
![](https://qallA ray passes through a rectangular glass slab and emerges into air. Which statement is correct?
![](https://qFor refraction at an interface between two media, Snell's law is correctly written as
![](https://qallery.appIf the lower half of a concave mirror is covered with an opaque material, what happens to the image of an objeA concave mirror has focal length $f=-7.5\,\text{cm}$. An object is placed at $u=-5\,\text{cm}$. The image forFor a spherical mirror under the paraxial approximation, the focal length $f$ and radius of curvature $R$ are A paraxial ray parallel to the principal axis falls on a concave spherical mirror. After reflection, the ray pAccording to the Cartesian sign convention for mirrors, which statement is correct for an object placed in froA convex lens $A$ of focal length $20\,\mathrm{cm}$ and a concave lens $B$ of focal length $5\,\mathrm{cm}$ arLight enters at an angle of incidence in a transparent rod of refractive index $n$. For what value of the refr