Science Practice Quiz 92

Q1.What does 1 dioptre represent?

A. The power of a lens whose focal length is 1 centimetre B. The power of a lens whose focal length is 1 metre C. The power of a lens whose focal length is 1 millimetre D. The power of a lens whose focal length is 1 kilometre

Q2.How is 1 dioptre mathematically expressed in relation to focal length, as per the provided information?

A. 1D = 1m B. 1D = 1m⁻¹ C. 1D = 1cm⁻¹ D. 1D = 1mm⁻¹

Q3.What is the nature of the power of a convex lens?

A. Negative B. Positive C. Zero D. Variable

Q4.What is the nature of the power of a concave lens?

A. Positive B. Negative C. Zero D. Indeterminate

Q5.If a lens prescribed has a power equal to +2.0 D, what is its focal length and type?

A. +0.50 m, convex B. -0.50 m, concave C. +2.0 m, convex D. -2.0 m, concave

Q6.A concave lens has a focal length of 2 m. What is its power?

A. +0.5 D B. -0.5 D C. +2.0 D D. -2.0 D

Q7.When a number of lenses are placed in contact, how is their net power (P) calculated?

A. By multiplying individual powers B. By dividing individual powers C. By taking the algebraic sum of individual powers D. By subtracting individual powers

Q8.What is the net power of a combination of two lenses with powers +2.0 D and +0.25 D?

A. +1.75 D B. +2.25 D C. +0.50 D D. +8.0 D

Q9.For which professionals is the use of powers, instead of focal lengths, particularly convenient?

A. Astronomers B. Opticians C. Photographers D. Engineers

Q10.What is the relationship between the focal length (f) and the radius of curvature of a spherical mirror?

A. f = R B. f = 2R C. f = R/2 D. f = 1/R

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Science Practice Quiz 92