JEE Advanced Physics Syllabus can be referred by the IIT aspirants to get a detailed list of all topics that are important in cracking the entrance examination. JEE Advanced syllabus for Physics has been designed in such a way that it offers very practical and application-based learning to further make it easier for students to understand every concept or topic by correlating it with day-to-day experiences. In comparison to the other two subjects, the syllabus of JEE Advanced for physics is developed in such a way so as to test the deep understanding and application of concepts.

**Q1.**

**Statement 1: By increasing the diameter of the objective of telescope, we can increase its range**

Statement 2: The range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope

Statement 2: The range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope

Solution

(b)The light gathering power (or brightness) of a telescope ∝(diameter)^2. So by increasing the objective diameter even far off stars may produce images of optimum brightness

(b)The light gathering power (or brightness) of a telescope ∝(diameter)^2. So by increasing the objective diameter even far off stars may produce images of optimum brightness

**Q2.**

**Statement 1: If the angles of the base of the prism are equal, then in the position of minimum deviation, the refracted ray will pass parallel to the base of prism**

Statement 2: In the case of minimum deviation, the angle of incidence is equal to the angle of emergence

Statement 2: In the case of minimum deviation, the angle of incidence is equal to the angle of emergence

Solution

(a) In case of minimum deviation of a prism ∠i=∠e

so ∠r_1=∠r_2

(a) In case of minimum deviation of a prism ∠i=∠e

so ∠r_1=∠r_2

**Q3.**

**Statement 1: The polar caps of earth are cold in comparison to equatorial plane**

Statement 2: The radiation absorbed by polar caps is less than the radiation absorbed by equatorial plane

Statement 2: The radiation absorbed by polar caps is less than the radiation absorbed by equatorial plane

Solution

(c) Polar caps receives almost the same amount of radiation as the equatorial plane. For the polar caps angle between sun rays and normal (to polar caps) tends to 90°. As per Lambert’s cosine law, E∝cosÎ¸, therefore E is zero. For the equatorial plane, Î¸=0°, therefore E is maximum. Hence polar caps of earth are so cold. (where E is radiation received)

(c) Polar caps receives almost the same amount of radiation as the equatorial plane. For the polar caps angle between sun rays and normal (to polar caps) tends to 90°. As per Lambert’s cosine law, E∝cosÎ¸, therefore E is zero. For the equatorial plane, Î¸=0°, therefore E is maximum. Hence polar caps of earth are so cold. (where E is radiation received)

**Q4.**

**Statement 1: The fluorescent tube is considered better than an electric bulb**

Statement 2: Efficiency of fluorescent tube is more than the efficiency of electric bulb

Statement 2: Efficiency of fluorescent tube is more than the efficiency of electric bulb

Solution

(a) The efficiency of fluorescent tube is about 50 lumen/watt,

whereas efficiency of electric bulb is about 12 lumen/watt.

Thus for same amount of electric energy consumed, the tube gives nearly 4 times more light than the filament bulb

(a) The efficiency of fluorescent tube is about 50 lumen/watt,

whereas efficiency of electric bulb is about 12 lumen/watt.

Thus for same amount of electric energy consumed, the tube gives nearly 4 times more light than the filament bulb

**Q5.**

**Statement 1: The formula connecting u,v and f for a spherical mirror is valid only for mirrors whose sizes are very small compared to their radii of curvature.**

Statement 2: Laws of reflection are strictly valid for plane surfaces, but not for large spherical surfaces.

Statement 2: Laws of reflection are strictly valid for plane surfaces, but not for large spherical surfaces.

Solution

(c) Laws reflection can be applied to any type of surface

(c) Laws reflection can be applied to any type of surface

**Q6.**

**Statement 1: For the sensitivity of a camera, its aperture should be reduced**

Statement 2: Smaller the aperture , image focusing is also sharp

Statement 2: Smaller the aperture , image focusing is also sharp

Solution

(c)

Very large apertures gives blurred images because of aberrations.

By reducing the aperture the clear image is obtained and thus the sensitivity of camera increases.

Also the focussing of object at different distance is achieved by slightly altering the separation of the lens from the film

(c)

Very large apertures gives blurred images because of aberrations.

By reducing the aperture the clear image is obtained and thus the sensitivity of camera increases.

Also the focussing of object at different distance is achieved by slightly altering the separation of the lens from the film

**Q7.**

**Statement 1: The focal length of lens does not change when red light is replaced by blue light**

Statement 2: The focal length of lens does not depends on colour of light used

Statement 2: The focal length of lens does not depends on colour of light used

Solution

(d)Focal length of the lens depends upon it’s refractive index as 1/f∝(Î¼-1)

Since Î¼_b>Î¼_r so f_b less than f_r

Therefore, the focal length of a lens decreases when red light is replaced by blue light

(d)Focal length of the lens depends upon it’s refractive index as 1/f∝(Î¼-1)

Since Î¼_b>Î¼_r so f_b less than f_r

Therefore, the focal length of a lens decreases when red light is replaced by blue light

**Q8.**

**Statement 1: Owls can move freely during night**

Statement 2: They have large number of rods on their retina

Statement 2: They have large number of rods on their retina

Solution

Owls can move freely during night, because they have large number of cones on their retina which help them to see in night

Owls can move freely during night, because they have large number of cones on their retina which help them to see in night

**Q9.**

**Statement 1: A virtual image can be photographed**

Statement 2: Only a real image can be formed on a screen

Statement 2: Only a real image can be formed on a screen

Solution

The rays of light are diverging out from a virtual image. These can be easily converged onto the film of a concave lens by convergent action of its lens

The rays of light are diverging out from a virtual image. These can be easily converged onto the film of a concave lens by convergent action of its lens

**Q10.**

**Statement 1: If objective and eye lenses of a microscope are interchanged then it can work as telescope**

Statement 2: The objective of telescope has small focal length

Statement 2: The objective of telescope has small focal length

Solution

We cannot interchange the objective and eye lens of a microscope to make a telescope. The reason is that the focal length of lenses in microscope are very small, of the order of mm or a few cm and the difference (f_o-f_e) is very small, while the telescope objective have a very large focal length as compared to eye lens of microscope

We cannot interchange the objective and eye lens of a microscope to make a telescope. The reason is that the focal length of lenses in microscope are very small, of the order of mm or a few cm and the difference (f_o-f_e) is very small, while the telescope objective have a very large focal length as compared to eye lens of microscope