Which of the following mirrors is used by Archimedes to burn the ships?
A) Bi-concave
B) Bi-convex
C) Concave
D) Convex
1 Answers
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How many litres of oxygen at STP are required to burn completely 2.2 g of propane, C3H8?
Given : Mass of propane used up in reaction = 2.2 g To find : Volume of oxygen required at STP Calculation : The balanced chemical equation for the combustion of propane is, C3H8 + 5O2 → 3CO2...
2 Answers 2 views
Explain the formula to find the number of images formed when an object is placed in between two plane mirrors inclined at an angle θ.
1. If an object is kept between two plane mirrors inclined at an angle θ, multiple images (N) are formed due to multiple reflections from both the mirrors. 2. The number...
2 Answers 1 views
What is lateral magnification? How does it vary in different types of spherical mirrors?
i. Ratio of linear size of image to that of the object, measured perpendicular to the principal axis, is defined as the lateral magnification. ∴ m = \(\frac{h_2}{h_1}=\frac{v}{u}\) (for spherical lenses) m = \(-\frac{v}{u}\) (for spherical...
2 Answers 1 views
A small object is kept symmetrically between two plane mirrors inclined at 38°. This angle is now gradually increased to 41°
The object is kept symmetrically between two plane mirrors. This implies the object is placed at angle bisector. Thus, for θ = 38°, n = \(\frac{360}{38}\) = 9.47 As it is not integral, N =...
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The scientist who used mirrors to burn ships was ………………..
C) Archimedes
2 Answers 1 views
Which of the following mirrors is used by dentists ? A) Concave
Correct option is A) Concave
2 Answers 1 views
For which mirrors the magnification is always same ?
C) Plane mirror
2 Answers 1 views
Assertion (A) Dentists use convex mirrors. Reason (R) : Convex mirrors enlarge the image when the object is held close to the mirror
D) Both ‘A’ and ‘R’ are wrong.
2 Answers 4 views
Hydraulic jack works on the principle of A) Archimedes’ principle
C) Pascal’s principle
2 Answers 4 views
Ships are made based on the principle of …………….
Correct option is D) buoyancy
2 Answers 1 views