How will the image formed by a convex lens be affected if the central portion of the lens is wrapped in black paper?
How will the image formed by a convex lens be affected if the central portion of the lens is wrapped in black paper?
Show Hint
Any image is formed by a large number of rays passing from the object.
- Full image will be formed but without the central portion
- Two images will be formed, one due to each exposed half
- No image will be formed
- Full image will be formed but it is less bright.
The Correct Option is D
Approach Solution - 1
Any image is formed by a large number of rays passing from the object. Therefore, if any part of the lens is covered, the brightness of the image will be less as compared to the image formed without wrapping the lens.
Therefore option D) is the correct answer - If the central portion of the convex lens is wrapped in black paper, then a full image will be formed but it will be less bright.
Convex lens with central portion wrapped in black paper
Approach Solution -2
The correct option is D: “Full image will be formed but it is less bright”.
A full image will be formed by the lens but its brightness will reduce as some light will be obstructed by a dark region.
Top Questions on Ray optics and optical instruments
- An effective power of a combination of 5 identical convex lenses which are kept in contact along the principal axis is 25 D. Focal length of each of the convex lens is :
- JEE Main - 2024
- Physics
- Ray optics and optical instruments
- The position of the image formed by the combination of lenses is :
- JEE Main - 2024
- Physics
- Ray optics and optical instruments
- Given below are two statements:
Statement (I): When an object is placed at the centre of curvature of a concave lens, image is formed at the centre of curvature of the lens on the other side.
Statement (II): Concave lens always forms a virtual and erect image.
In the light of the above statements, choose the correct answer from the options given below:- JEE Main - 2024
- Physics
- Ray optics and optical instruments
- If the distance between object and its two times magnified virtual image produced by a curved mirror is 15 cm, the focal length of the mirror must be :
- JEE Main - 2024
- Physics
- Ray optics and optical instruments
- The distance between object and its 3 times magnified virtual image as produced by a convex lens is 20 cm. The focal length of the lens used is __________ cm.
- JEE Main - 2024
- Physics
- Ray optics and optical instruments
Questions Asked in KCET exam
- If \(\lim\limits_{x \rightarrow 0} \frac{\sin(2+x)-\sin(2-x)}{x}\)= A cos B, then the values of A and B respectively are
- KCET - 2023
- limits of trigonometric functions
- The Curie temperatures of Cobalt and iron are 1400K and 1000K respectively. At T = 1600K , the ratio of magnetic susceptibility of Cobalt to that of iron is
- KCET - 2023
- Magnetism and matter
- A particle is in uniform circular motion. Related to one complete revolution of the particle, which among the stataments is incorrect ?
- KCET - 2023
- Uniform Circular Motion
- The modulus of the complex number \(\frac{(1+i)^2(1+3i)}{(2-6i)(2-2i)}\) is
- KCET - 2023
- complex numbers
- The energy gap of an LED is 2.4 eV. When the LED is switched ‘ON’, the momentum of the emitted photons is
- KCET - 2023
- Semiconductor electronics: materials, devices and simple circuits
Concepts Used:
Ray Optics and Optical Instruments
Optics, deals with the determination of behaviour and the properties of light, along with its interactions with the matter and also with the instruments that are used to detect it.
Ray optics is also known as the geometrical optics and it is a branch of science which describes light propagation.
Reflection is the change in direction of light at an interface in-between two different media so that the wave-front returns into a medium from which it was originated.
Speed of light is the rate at which the light travels in free space.
A phenomenal change in image formed when the light is passed from one medium to another which is called Refraction.
Total Internal Reflection is the reflection of light when the light ray enters into a rarer medium from a denser medium and the angle of incidence is higher than the critical angle of incidence then that light ray will be reflected back to the denser medium.
Read More: Ray Optics and Optical Instruments
SUBSCRIBE TO OUR NEWS LETTER
