optical

"The coffee machine automatically dispenses hot water when you press the button. "

"The design of his house incorporates a spiral staircase."

"The student used a microscope to see the tiny cells in the plant leaf. "

"The teacher's encouragement helped enhance the students' confidence. "

"My uncle is a computer for our family; he's always calculating budgets and costs. "

"My sister has a sensitivity to subtle changes in the weather; she can feel an approaching storm hours before anyone else notices. "

"The violinist was a master of her instrument."

""The doctor said little Sarah has strabismus, which is why her eyes sometimes look crossed." "

"The students designed posters for the school fair. "

"The refraction of light makes a straw in a glass of water appear bent. "

"Please relate the circumstances of your journey here today."

"The information about the project deadline resolved my uncertainty; now I know what needs to be completed. "