What happens to the focal length of a convex lens when it is immersed in water ?

Independent of the medium where it is immersed

When light falls on a smooth polished surface, most of it

is reflected in the same direction

is refracted into the second medium

is reflected in different directions

Assertion (A) : If refractive index of one medium is equal to the refractive index of the second medium, then the light ray does not bend at all. Reason (R) : The bending of light does not depend upon the refractive index of the medium

Both A and R are true but R is not the correct explanation of A

Both A and R are true and R is the correct explanation of A

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Create a reading comprehension quiz based on the following text: Not many people 'have heard/ heard of Nikola Tesla, who 2played/was playing a key role in creating the alternating current (AC) supply of electricity we are having/ have in our homes today. Early in his career, Tesla has worked / worked with Thomas Edison. He had emigrated/ has emigrated to the USA from Europe in 1884. While Tesla was working/ had worked for Edison, they had an argument over payment for an invention, so Tesla was deciding/ decided to work independently. It was then that he developed a motor that could produce an alternating current. Throughout his life, Tesla continued to conduct experiments and helped / was helping develop X-ray radiography and wireless communication. There is no doubt that he has had / had had a large impact on modern technology. Many of the gadgets that we 10 are enjoying/enjoy today would not have been possible without Nikola Tesla.

The Pedestrian (adapted) by Ray Bradbury Mr. Leonard Mead loved to walk outside at night. The city was quiet at eight o’clock on a misty November evening. He liked to put his hands in his pockets and stroll along the cracked sidewalks, stepping over grass that grew between the concrete. He would stop at the corners, look down the empty streets, and choose which way to go. It didn’t really matter which way he picked, because he was always alone in the year 2053. Sometimes, Mr. Mead would walk for hours and miles, coming home only at midnight. As he walked, he saw houses with their windows dark, like he was walking through a graveyard. Sometimes, he saw tiny flashes of light from behind curtains or heard soft voices from open windows. Mr. Mead wore sneakers so his footsteps wouldn’t make noise. If he wore shoes with hard heels, the dogs would bark and people might look out their windows. He liked being quiet and unnoticed as he walked in the cool November air. On this night, Mr. Mead walked west, toward the sea. The air was cold and frosty, making his nose sting and his lungs feel fresh. He listened to the sound of his shoes in the fallen leaves and sometimes picked up a leaf to look at it under the streetlights. As he walked, he whispered to the houses, “Hello in there. What’s on TV tonight? Where are the cowboys? Is the cavalry coming?” But the street was silent and empty, with only his shadow moving. He checked his watch. “Eight-thirty. Is it time for a quiz show? Or a funny show?” He thought he heard laughter from a house, but nothing else happened. He kept walking, sometimes stumbling over the broken sidewalk. In all his years of walking, he had never seen another person out at night. He reached a big intersection where two highways crossed. During the day, it was full of cars, but now it was empty and quiet, like a dry riverbed. Mr. Mead turned onto a side street, heading home. Suddenly, a police car turned the corner and shined a bright light on him. He stood still, surprised by the light. A metallic voice from the car said, “Stand still. Don’t move! Put up your hands!” Mr. Mead obeyed. The police car asked, “What’s your name?” “Leonard Mead,” he answered. “What’s your job?” “I guess I’m a writer,” Mr. Mead said. The police car replied, “No profession.” Mr. Mead hadn’t written anything in years, since people didn’t buy books or magazines anymore. People just stayed inside their houses, watching TV. The car asked, “What are you doing out?” “I’m walking,” Mr. Mead said. “Walking? Just walking?” the car repeated. “Yes,” he said. “Where are you walking? Why?” “For air. To see things,” Mr. Mead answered. “Your address?” “Eleven South Saint James Street.” “Do you have air in your house? An air conditioner?” “Yes.” “Do you have a TV?” “No.” “No?” The car was quiet for a moment. “Are you married?” “No,” Mr. Mead said. “Not married,” the car said. The night was cold and quiet. “Just walking, Mr. Mead?” “Yes.” “But why?” “I told you. For air, to see, and just to walk.” “Do you do this often?” “Every night for years.” The police car was silent for a moment. Then it said, “Get in.” The back door opened. “Wait, I haven’t done anything!” Mr. Mead protested. “Get in,” the car repeated. Mr. Mead looked into the car. There was no one inside, just an empty front seat. The back seat was like a small jail cell, cold and hard. “Where are you taking me?” he asked. The car answered, “To the Psychiatric Center for Research on Regressive Tendencies.” Mr. Mead got in. The door closed, and the car drove away through the empty streets. As they passed his house, he saw that all the lights were on. “That’s my house,” he said, but no one answered. The car drove off into the night, leaving the streets empty and silent for the rest of the cold November night.

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