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A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is a concave lens of focal length

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

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An object of size 3.0cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the

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What is the focal length of a convex lens of focal length 30cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the

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

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A compound microscope consists of an objective lens of focal length 2.0cm and an eyepiece of focal length 6.25cm separated by a distance of 15cm. How far from the objective should an object be placed in order to obtain the final image at the least distance of distinct vision

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

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A compound microscope consists of an objective lens of focal length 2.0cm and an eyepiece of focal length 6.25cm separated by a distance of 15cm. How far from the objective should an object be placed in order to obtain the final image at at infinity? What is the magnifying

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

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A person with a normal near point (25cm) using a compound microscope with objective of focal length 8.0 mm and an eyepiece of focal length 2.5cm can bring an object placed at 9.0mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of the

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

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A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length 6.0cm. What is the magnifying power of the telescope? What is the separation between the objective and the

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A giant refracting telescope at an observatory has an objective lens of focal length 15m. If an eyepiece of focal length 1.0cm is used, what is the angular magnification of the

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If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.48 × 106m, and the radius of lunar orbit is 3.8 ×

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

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Use the mirror equation to deduce that: an object placed between f and 2f of a concave mirror produces a real image beyond

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

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Use the mirror equation to deduce that: a convex mirror always produces a virtual image independent of the location of the

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Use the mirror equation to deduce that: the virtual image produced by a convex mirror is always diminished in size and is located between the focus and the

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Use the mirror equation to deduce that: an object placed between the pole and focus of a concave mirror produces a virtual and enlarged image. [Note: This exercise helps you deduce algebraically properties of images that one obtains from explicit ray

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

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A small pin fixed on a table top is viewed from above from a distance of 50cm. By what distance would the pin appear to be raised if it is viewed from the same point through a 15cm thick glass slab held parallel to the table? Refractive index of glass = 1.5. Does the answer depend on the location of the

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

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(i) Fig. shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure.(ii) What is the answer if there is no outer covering of the

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

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Explain: You have learnt that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances?

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

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Explain: A virtual image, we always say, cannot be caught on a screen. Yet when we ‘see’ a virtual image, we are obviously bringing it on to the ‘screen’ (i.e., the retina) of our eye. Is there a

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

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Explain: A diver under water, looks obliquely at a fisherman standing on the bank of a lake. Would the fisherman look taller or shorter to the diver than what he actually

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

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Explain: Does the apparent depth of a tank of water change if viewed obliquely? If so, does the apparent depth increase or

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

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Explain: The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to a diamond

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

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