A lens is bounded by two spherical surfaces, thin at the middle and thicker at the edges is called …………………..
A) bi convex lens
B) bi concave lens
C) piano – concave lens
D) piano – convex lens
1 Answers
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Consider a grid with 8 parallel vertical edges and 9 parallel horizontal edges, consecutive edges being separated by distance unity- (i) Find the numb
Correct Answer - (i) `- 1008`, (ii) `-320`, (iii) `-68`, (iv) `-168`, (v) `-97`
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A transparent material is bounded by two surfaces of which one (or) both – surfaces are spherical is called
Correct option is D) lens
2 Answers 2 views
A lens which has thick at the middle and thinner at the edges is called ……………………
A) bi convex lens
2 Answers 1 views
The lens which is thin at the middle on both sides and thicker at the edges is …………………….
D) bi concave
2 Answers 1 views
The Convex lens behaves as a converging lens if it is kept in a medium with refractive index less than the refractive index of the lens.
B) Both statements are false
2 Answers 1 views
The focal length of double concave lens kept in air with two spherical surfaces of radii R1 = 30 cm and R2 = 60 cm
Correct option is B) – 40 cm
2 Answers 1 views
A double convex lens has two surfaces of equal radii “R” and refractive index n = 1.5. The focal length is …………………..
Correct option is B) +R
2 Answers 1 views
The edges of surfaces are
Correct option is A) lines
2 Answers 1 views
A spherical mirror and a thin spherical lens have each a focal length of – 15 cm. The mirror and the lens are likely to be …………….
B) both are concave
2 Answers 1 views
Assertion: Ammonia is generaiiy excreted by diffusion across body surfaces or through gin surfaces (in fish) as ammonium ions. Reason: Ammonia is rea
Correct Answer - A Ammonia, as it is readily soluble, is generally excreted by diffusion across body surfaces or through gill surfaces (in fish) as ammonium ions. Kidneys do not play...
2 Answers 1 views