# Light – Reflection and Refraction Mcq Questions

Jun 17th, 2015
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1) To form a real image,the mirror required is: a) convex b) concave c) both convex and concave d) cannot say 2) To obtain magnified,inverted image in a concave mirror,object should be held: a) at pole b) at focus c) beyond 2f d) between f and 2f 3) Which mirror cannot form a magnified image? a) convex b) concave c) both convex and concave

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The Life of a StarThis page (as the title says) is all about the life of a star. It will show all the stages that a small star, and a massive star have to go through during their lifetime. We have all sorts of pics and links for you to look at and explore when you are just about ready to recieve that vast information that we have kindly put together.But we have one FAQ!What is a Star?Stars are hot bodies of glowing gas that start their life inNebulae.They vary in size, mass and temperature, diameters ranging from 450x smaller to over 1000x larger than that of the Sun. Masses range from a twentieth to over 50 solar masses and surface temperature can range from 3,000 degrees Celcius to over 50,000 degrees Celcius.The colour of a star is determined by its temperature, the hottest stars are blue and the coolest stars are red. The Sun has a surface temperature of 5,500 degrees Celcius, its colour appears yellow.The energy produced by the star is by nuclear fusion in the stars core. The brightness is measured in magnitude, the brighter the star the lower the magnitude goes down. There are two ways to measuring the brightness of a star, apparent magnitude is the brghtness seen from Earth, and absolute magnitude which is the brightness of a star seen from a standard distance of 10 parsecs (32.6 light years). Stars can be plotted on a graph using the Hertzsprung Russell Diagram (see picture below).It shows that the temerature coincides with the luminosity, the hotter

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