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Solve the following problem.
Find the value of resistance for the following colour code.
Blue Green Red Gold
Concept: undefined >> undefined
Solve the following problem.
Find the value of resistance for the following colour code.
Brown Black Red Silver
Concept: undefined >> undefined
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Solve the following problem.
Find the value of resistance for the following colour code.
Red Red Orange Gold
Concept: undefined >> undefined
Solve the following problem.
Find the value of resistance for the following colour code.
Orange White Red Gold
Concept: undefined >> undefined
Find the value of resistance for the following colour code.
Yellow Violet Brown Silver
Concept: undefined >> undefined
Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
330 Ω
Concept: undefined >> undefined
Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
100 Ω
Concept: undefined >> undefined
Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
47 kΩ
Concept: undefined >> undefined
Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
160 Ω
Concept: undefined >> undefined
Solve the following problem.
Find the colour code for the following value of resistor having tolerance ± 10%
1 KΩ
Concept: undefined >> undefined
Choose the correct option.
Current through a reverse-biased p-n junction increases abruptly at:
Concept: undefined >> undefined
Answer in detail.
Discuss the effect of external voltage on the width of depletion region of a p-n junction.
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Choose the correct option.
A student uses spectacles of number -2 for seeing distant objects. Commonly used lenses for her/his spectacles are
Concept: undefined >> undefined
Consider the following statements regarding a simple microscope
(P) It allows us to keep the object within the least distance of distant vision.
(Q) Image appears to be biggest if the object is at the focus.
(R) It is simply a convex lens.
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Answer the following question.
A spherical surface separates two transparent media. Derive an expression that relates object and image distances with the radius of curvature for a point object. Clearly state the assumptions, if any.
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Answer the following question.
Derive lens makers’ equation. Why is it called so? Under which conditions focal length f and radii of curvature R are numerically equal for a lens?
Concept: undefined >> undefined
Solve Numerical example.
A convex lens held some distance above a 6 cm long pencil produces its image of SOME size. On shifting the lens by a distance equal to its focal length, it again produces the image of the SAME size as earlier. Determine the image size.
Concept: undefined >> undefined
A point object is kept 10 cm away from one of the surfaces of a thick double convex lens of refractive index 1.5 and radii of curvature 10 cm and 8 cm. Central thickness of the lens is 2 cm. Determine location of the final image considering paraxial rays only.
Concept: undefined >> undefined
Solve Numerical example.
A person uses spectacles of ‘number’ 2.00 for reading. Determine the range of magnifying power (angular magnification) possible. It is a concavoconvex lens (n = 10.5) having a curvature of one of its surfaces to be 10 cm. Estimate that of the other.
Concept: undefined >> undefined
Solve Numerical example.
Focal power of the eye lens of a compound microscope is 6 dioptre. The microscope is to be used for maximum magnifying power (angular magnification) of at least 12.5. The packing instructions demand that length of the microscope should be 25 cm. Determine minimum focal power of the objective. How much will its radius of curvature be if it is a biconvex lens of n = 1.5?
Concept: undefined >> undefined
