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With the help of a suitable ray diagram, derive a relation between the object distance (u), image distance (v) and radius of curvature R for the convex spherical surface when a ray of light travels from a rarer to denser

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Two convex lenses of same focal length but of apertures `A_1 and A_2 (A_2 < A_1)`, are used as the objective lenses in two astronomical telescopes having identical eyepieces. What is the ratio of their resolving power? Which telescope will you prefer and why? Give

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Between the primary and secondary rainbows, there is a dark band known as Alexandar’s dark band. This is

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What is the Brewster angle for air to glass transition? (Refractive index of glass =

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Why are coherent sources required to create interference of

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State Huygens' principle of diffraction of

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For light diverging from a point

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What is the shape of the wavefront on earth for

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Consider a two slit interference arrangements (Fig. ) such that the distance of the screen from the slits is half the distance between the slits. Obtain the value of D in terms of λ such that the first minima on the screen falls at a distance D from the centre

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Estimating the following two numbers should be interesting. The first number will tell you why radio engineers do not need to worry much about photons! The second number tells you why our eye can never ‘count photons’, even in barely detectable light. The number of photons entering the pupil

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Answer the following questions: Why should gases be insulators at ordinary pressures and start conducting at very low

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Two monochromatic beams A and B of equal intensity I, hit a screen. The number of photons hitting the screen by beam A i twice that by beam B. Then what inference can you make about their

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A particle A with a mass mA is moving with a velocity v and hits a particle B (mass mB) at rest (one dimensional motion). Find the change in the de Broglic wavelength of the particle A. Treat the collision as

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`10^(12) alpha` – particles (Nuclei of helium) per second falls on a neutral sphere, calculate time in which sphere gets charged by

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For infinite line distribution of charge draw the curve between log E and log

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The variation of potential with distance x from a fixed point is shown in figure. Find the magnitude of the electric field (in `V'/'m`) at `x

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Three concentric spherical shells have radii a, b and c (a < b < c) and have surface charge densities σ, – σ and σ respectively. If `V_A , V_B` and `V_C` denote the Potentials of the three shells, then for c = a + b, we

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The electric potential V is given as a function of distance x (metre) by `V = (5x ^2 + 10x – 9)` volt. Value of electric field at `x = 1` is

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The displacement of a charge Q in the electric field `vecE = e_1hat i + e_2 hatj + e_3 hatk` is `vecr = ahati + bhat j` . The work done is

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Explosions on other planets are not heard on earth.

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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