Name The Year: Modest Moussorgsky, composer, born.?

Questions

Optical device, commonly made of glass, with a smooth, polished surface that forms images by the reflection of rays of light (light; optics; reflection)?

Oranges & lemons, the bells of ......?

Oranges, lemons, watermelons, & tomatoes are all what?

Order of insects containing more than 100,000 species, including ants, bees, wasps, sawflies, chalcids, & ichneumons?

Organic chemical compounds containing a group of two nitrogen atoms attached to each other?