Question 1 :
The focal length of objective and eye lens of a microscope are 4 cm and 8 cm respectively. If the least distance of distinct vision is 24 cm and object distance is 4.5 cm from the objective lens, then the magnifying power of the microscope will be

Question 2 :
A convex lens of focal length 10.0 cm is placed in contact with a convex lens of 15.0 cm focal length. What is the focal length of the combination ?

Question 3 :
A light bulb is placed between two plane mirrors inclined at an angle of {tex}60{}^\circ .{/tex} The number of images formed are[NCERT 1980; CPMT 1996, 97; SCRA 1994; AIIMS 1997; RPMT 1999; AIEEE 2002;Orissa JEE 2003; MP PMT 2004; MP PET 2004]

Question 4 :
Which of the following is not due to total internal reflection?

Question 5 :
A point object is placed at a distance of 30 cm from a convex mirror of focal length 30cm. The image will form at [JIPMER 2002]

Question 6 :
An astronomical telescope has a magnifying power 10. The focal length of eyepiece is 20 cm. The focal length of objective is[MP PMT 2002, 03; Pb. PET 2004]

Question 7 :
In Youngs experiment, the ratio of maximum to minimum intensities of the fringe system is 4:1. The amplitudes of the coherent sources are in the ratio

Question 8 :
If the focal length of the objective lens is increased then[MP PMT 1994]

Question 9 :
Two plane mirrors are at {tex}45{}^\circ {/tex} to each other. If an object is placed between them, then the number of images will be[MP PMT 2003]

Question 11 :
Which of the following phenomena can explain quantum nature of light

Question 16 :
A convex lens is used to form real image of an object on a screen. It is observed that even when the positions of the object and that screen are fixed there are two positions of the lens to form real images.If the heights of the images are 4 cm and 9 cm respectively, the height of the object is [AMU (Med.) 1999]

Question 17 :
An object of size {tex}7.5cm{/tex} is placed in front of a convex mirror of radius of curvature {tex}25cm{/tex} at a distance of {tex}40cm.{/tex}The size of the image should be

Question 19 :
The wave theory of light, in its original form, was first postulated by

Question 22 :
An object is placed {tex}40cm{/tex} from a concave mirror of focal length {tex}20cm.{/tex} The image formed is [MP PET 1986; MP PMT/PET 1998]

Question 23 :
For which of the following colour, the magnifying power of a microscope will be maximum

Question 24 :
The bending of beam of light around corners of obstacles is called

Question 25 :
Through quantum theory of light we can explain a number of phenomena observed with light, it is necessary to retain the wave nature of light to explain the phenomenon of

Question 27 :
Assertion:The size of the mirror affect the nature of the image. Reason:Small mirrors always forms a virtual image.

Question 28 :
Radio waves diffract around building although light waves do not. The reason is that radio waves

Question 30 :
A plano-convex lens is made of refractive index of 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is[Pb. PET 2000]

Question 32 :
A point source of 3000 lumen is located at the centre of a cube of side length 2m. The flux through one side is

Question 35 :
Light waves can propagate through vacuum but sound waves cannot do so. Mark the wrong statement

Question 37 :
A parallel beam of fast moving electrons is incident normally on a narrow slit. A screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statement is correct

Question 38 :
In the Youngs double slit experiment, the interference pattern is found to have an intensity ratio between bright and dark fringes as 9. This implies that

Question 39 :
Yellow light is used in single slit diffraction experiment with slit width 0.6 mm. If yellow light is replaced by X-rays, then the pattern will reveal that

Question 40 :
An interference pattern was made by using red light. If the red light changes with blue light, the fringes will become

Question 41 :
Interference was observed in interference chamber when air was present, now the chamber is evacuated and if the same light is used, a careful observer will see

Question 42 :
A parallel beam of fast moving electrons is incident normally on a narrow slit. A screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statement is correct?

Question 44 :
Consider the following statements <img style='object-fit:contain' width=9 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea297208ab67a08eba55c8d"> and <img style='object-fit:contain' width=10 height=20 src="https://storage.googleapis.com/teachmint/question_assets/NEET/5ea297a701a30b5955496f96"> and identify the correct answer<br> A. Polarised light can be used to study the helical surface of nucleic acids<br> B. Optics axis is a direction and not any particular line in the crystal

Question 45 :
The sun is rotating about its own axis. The spectral lines emitted from the two ends of its equator, for an observer on the earth, will show

Question 46 :
A ray is incident at an angle $38^o $ on a mirror. The angle between normal and reflected ray is _________.

Question 47 :
A beam of light of {tex} \lambda = 600 \mathrm { \mu m } {/tex} from a distant source falls on a single slit {tex}1 \mathrm { mm } {/tex} wide and the resulting diffraction pattern is observed on a screen {tex} 2\mathrm { m } {/tex} away. The distance between first dark fringes on either side of the central bright fringe is

Question 48 :
If yellow light emitted by sodium lamp in Young's double slit experiment is replaced by a monochromatic blue light of the same intensity

Question 49 :
Two light waves superimposing at the mid-point of the screen are coming from coherent sources of light with phase difference {tex} 3\pi {/tex} rad. Their amplitudes are {tex} 1\mathrm { cm } {/tex} each. The resultant amplitude at the given point will be.